Seiko Prospex HBB002 vs HBB001: Which Seiko Limited Edition Diver Should You Buy? | Lexor Miami

If you have narrowed your search down to two watches — the Seiko Prospex HBB002 PADI 60th Anniversary Limited Edition and the Seiko Prospex Sea HBB001 145th Anniversary Limited Edition — you are not alone. Both are 2026 Seiko limited editions built on proven Prospex dive-watch platforms, both carry a genuine production cap, and both are currently in stock at Lexor Miami. But they are built for slightly different buyers, and the $155 price gap between them ($750 vs. $595) is not the only thing that separates them.

This guide puts the two watches side by side — case size, movement, crystal, water resistance, production numbers, and price — so you can decide which one actually fits your wrist, your budget, and the story you want on your wrist for the next decade.

Shop the Seiko Prospex HBB002 at Lexor Miami

Meet the Two Watches

The Seiko Prospex HBB002 is built on Seiko's "King Turtle" case — the cushion-shaped 45mm silhouette with the crown at 4 o'clock that has anchored nearly every Seiko x PADI collaboration since 2016. It commemorates two anniversaries at once: PADI's 60th year as the world's largest diving organization, and 10 years of the Seiko x PADI partnership. Production is capped at 8,000 pieces worldwide, and it ships with both a stainless steel bracelet and a PADI-branded silicone strap.

The Seiko Prospex Sea HBB001 takes a different platform entirely — the more compact, angular Samurai case — and dresses it in a silver-white dial with two-tone "Seiko Blue" bezel detailing to mark Seiko's 145th anniversary as a company. Production is capped at 9,999 pieces, and it is priced $155 lower than the HBB002.

Both are genuine tool watches rather than diving-inspired fashion pieces: screw-down crowns, screw casebacks, unidirectional bezels, and 200-meter ISO-adjacent water resistance ratings. Where they diverge is everything else.

The Story Behind the HBB002: PADI's 60th Anniversary

To understand why the HBB002 commands a premium over a standard Prospex diver, it helps to understand what it actually commemorates. PADI — the Professional Association of Diving Instructors — was founded in 1966 and has since grown into the world's largest recreational scuba diving organization, with more than 30 million certified divers and instructors operating in over 180 countries. Seiko's relationship with PADI dates back to 2016, when the two organizations released the original SRPA21 PADI Turtle, a watch that introduced the now-iconic red-and-blue "Pepsi" bezel to the King Turtle case and quickly became one of the most talked-about affordable dive watches of that decade.

The HBB002 marks two milestones simultaneously: PADI's 60th year as an organization, and a full 10 years of the Seiko x PADI partnership. Seiko has also used the release to highlight a less-visible part of that relationship — for the past several years, Seiko Prospex has supported the PADI AWARE Foundation's ocean conservation initiatives through its own Save the Ocean program. For a meaningful share of buyers searching for this watch, that conservation tie-in matters as much as the dial design itself: they are not just buying a limited-edition Seiko, they are buying into a certification and a global diving community many of them are personally part of.

The Story Behind the HBB001: Seiko's 145th Anniversary

The HBB001 commemorates a different kind of milestone — Seiko's own corporate history. The company traces its roots to 1881, when Kintaro Hattori opened a small watch and clock shop in Tokyo's Ginza district. That shop eventually grew into one of the most influential watchmaking companies in the world, responsible for Japan's first wristwatch in 1913 and, decades later, the world's first quartz watch in 1969 — an innovation that permanently reshaped the global watch industry. In 2026, Seiko marked 145 years since that first shop opened with a series of anniversary releases spanning King Seiko, Presage, Astron, and Prospex. The anniversary releases arrived in two design waves: an earlier wave built around gold-tone accents symbolizing prosperity and longevity, and a second wave — which includes the HBB001 — built around "Seiko Blue," one of the brand's most recognizable design signatures since the 1960s. Where the HBB002's story is about a partnership with an external diving organization, the HBB001's story is entirely about Seiko itself: 145 continuous years of Japanese watchmaking, distilled into a single, wearable design detail.

HBB002 vs. HBB001: Full Specs Comparison

Spec	Seiko Prospex HBB002	Seiko Prospex Sea HBB001
Anniversary	PADI 60th / Seiko x PADI 10th	Seiko 145th
Case Platform	King Turtle	Samurai
Case Diameter	45mm	41.7mm
Case Thickness	13.2mm	12.3mm
Lug-to-Lug	47.7mm	49.5mm
Dial	Blue with globe motif, red accents	Silver-white with Seiko Blue bezel/seconds hand
Bezel	Blue ceramic, 60-minute	Two-tone Seiko Blue, unidirectional
Crystal	Sapphire with magnifier	Hardlex mineral crystal
Movement	Caliber 4R36 (24 jewels)	Caliber 4R35 (23 jewels)
Power Reserve	~41 hours	~41 hours
Water Resistance	200m	200m
Magnetic Resistance	4,800 A/m	4,800 A/m
Straps Included	Steel bracelet + PADI silicone strap	Steel bracelet (chamfered links)
Limited Edition Size	8,000 pieces	9,999 pieces
Price	$750	$595

Case Design: King Turtle vs. Samurai

This is the single biggest difference between the two watches, and it should drive most of your decision. The HBB002 wears the King Turtle case: a large, cushion-shaped 45mm silhouette with the crown tucked at 4 o'clock, a design lineage that traces back to Seiko's original 1970s Turtle divers. It has genuine wrist presence and reads as a serious, chunky tool watch — but the tapered cushion shape means it wears noticeably smaller than 45mm suggests on paper.

The HBB001 uses the Samurai platform instead: a more compact, faceted, blade-like case at 41.7mm that has become one of Seiko's most recognizable silhouettes over the last decade. It is easier to size for smaller wrists, sits lower on the wrist day to day, and slides more easily under a shirt cuff. If you have a wrist under 6.5 inches, or simply prefer a watch that does not dominate your forearm, the HBB001's case is the more forgiving choice.

Beyond raw dimensions, the two case families also wear differently in motion. The King Turtle's rounded, cushion-shaped flanks distribute weight evenly around the wrist and tend to rotate less during activity — a small but real advantage if you actually plan to wear the HBB002 while swimming or diving. The Samurai's angular, faceted surfaces on the HBB001 catch light differently depending on the angle, giving it a sharper, more technical look on the wrist that photographs distinctly from the softer King Turtle profile. Neither case shape is objectively better; they simply telegraph a different personality, and trying both on — in person if you can — is the most reliable way to know which one you will actually reach for every morning.

See the HBB002 King Turtle Case in Detail

Movement: Caliber 4R36 vs. Caliber 4R35

Both watches run on closely related Seiko workhorse calibers rather than a premium in-house movement, and it is worth being upfront about that since it is one of the most common questions buyers search before purchasing either piece. The HBB002 uses the Caliber 4R36 (24 jewels, with day/date display), while the HBB001 uses the Caliber 4R35 (23 jewels, date only). Both are automatic movements with manual winding capability and hacking seconds, both run at 21,600 vph, and both deliver approximately 41 hours of power reserve.

In practical terms, the difference between the two calibers is marginal — the 4R36 simply adds a day indicator alongside the date. Neither movement is chronometer-certified or independently regulated to a tighter tolerance than the other. If movement specification is the deciding factor for you, neither watch will outperform the other meaningfully; the choice comes down to case size, dial design, and price instead.

Both calibers are also worth putting in context against movements found in other watches at similar price points. Many fashion-brand automatics in the $500-$800 range use generic outsourced movements with limited service support and accuracy specs that are not publicly disclosed. Seiko manufactures both the 4R35 and 4R36 in-house, which means parts availability, accuracy standards, and servicing are all backed directly by Seiko rather than a third-party supplier — a meaningful difference for anyone planning to keep and maintain either watch for years rather than treat it as disposable.

Crystal: Sapphire vs. Hardlex

This is where the $155 price gap becomes easiest to justify. The HBB002 uses a sapphire crystal with a cyclops magnifier over the date window and anti-reflective coating on the inner surface — genuinely scratch-resistant glass that holds up to years of daily wear without fine surface marks. The HBB001 uses Seiko's proprietary Hardlex mineral crystal, which is more impact-resistant than sapphire but more prone to fine scratches over time.

Neither choice is wrong. Hardlex is standard across most of Seiko's sub-$700 Prospex catalog and is genuinely well-suited to a watch that might take real knocks during actual diving or daily wear. Sapphire is the more premium, scratch-resistant option, and it is one of the clearest reasons the HBB002 sits at a higher price point.

Styling Both Watches Day to Day

Although both are built as genuine tool watches, they wear comfortably far beyond the dive site — a big part of why Prospex divers have become a staple of modern casual and smart-casual wardrobes generally, not just dive gear bags. On its steel bracelet, the HBB002 reads substantial and polished enough to sit under a rolled shirt cuff or alongside a linen blazer for warm-weather evenings; swapped onto its included silicone strap, it becomes a lighter, more casual daily piece suited to gym sessions, beach days, or travel. Because its dial leans into a saturated blue with red accents, it pairs most naturally with cooler tones — grays, whites, and other blues — while still holding its own against warmer palettes.

The HBB001's silver-white dial and two-tone blue bezel give it more day-to-day versatility than a typical black-dial diver. It reads cleanly under a dress shirt cuff for office wear, but the Prospex dive-tool DNA — screw-down crown, rotating bezel, LumiBrite markers — keeps it from feeling out of place at the beach, on a boat, or in the water. Its more compact Samurai case also makes it the easier of the two to dress up for a smart-casual dinner without feeling oversized on the wrist.

Caring for Your Seiko Limited Edition

Automatic mechanical watches need a small amount of ongoing attention to keep running accurately and to protect their long-term value — worth knowing before either watch arrives, especially if this is your first serious automatic diver. Both the 4R36 and 4R35 movements will run for roughly 41 hours on a full wind before stopping, so a watch that sits unworn for more than a day or two will need manual winding (roughly 20-30 crown rotations with the crown unscrewed) or a few minutes on the wrist to build up reserve through natural motion.

Because the crowns and casebacks on both watches are screw-down, always confirm the crown is fully screwed in before either watch is exposed to water — this is the single most common cause of water resistance failure in screw-down dive watches, not a manufacturing defect. Rinse the case, bezel, and bracelet in fresh water after any exposure to saltwater or chlorine, and store either watch away from strong magnetic fields such as speaker magnets, laptop lids, and phone cases with magnetic closures, since the 4,800 A/m magnetic resistance rating on both references protects against everyday exposure but is not unlimited. If your HBB001 wears its Hardlex crystal, avoid setting it face-down on hard or abrasive surfaces, where fine scratches are more likely to appear over time than on the HBB002's sapphire glass. Like any mechanical watch, a service interval of roughly every 5-7 years from an authorized Seiko service center will keep either movement running within factory accuracy specifications over the long term.

Collectability and Long-Term Resale Outlook

It is worth setting realistic expectations here: no Seiko purchase should be treated as a guaranteed investment, and neither the HBB002 nor the HBB001 is an exception. What limited production does reliably do, however, is create a floor for demand once a reference sells out. Seiko's earlier PADI limited editions — most notably the original 2016 SRPA21 that started the partnership — have become sought-after pieces on the secondary market precisely because Seiko does not reproduce discontinued limited editions with the same specification. The HBB002's tighter 8,000-piece run, combined with PADI's built-in global community, gives it a modest edge in that regard over the HBB001's larger 9,999-piece allocation, though both are capped, dated, and individually meaningful releases that will not return once current stock sells through authorized dealers.

For collectors thinking about either watch as part of a broader Seiko or dive-watch collection, the numbered production, the commemorative packaging, and the anniversary story behind each release are the specific factors that tend to support long-term collector interest — more so than novelty color combinations alone. Buying now, while either piece is still available through an authorized channel at retail price, is the version of this purchase that carries the least risk and the most upside if demand continues to build after each production run sells out.

Water Resistance and Dive Credentials

Both watches are rated to 200 meters of water resistance and share the same core dive-watch engineering: screw-down crown, screw caseback, and a unidirectional rotating bezel that can only turn counter-clockwise — a basic safety feature that ensures an accidental bump underwater can only shorten your calculated dive time, never extend it. Both are genuinely capable of recreational scuba diving, not just splash resistance dressed up as a dive watch. On paper, there is no meaningful difference in dive capability between the two.

For buyers newer to Seiko, it helps to understand where both watches sit within the broader Prospex family. "Prospex" stands for Professional Specifications, and it is Seiko's dedicated line for watches engineered to perform in demanding conditions — diving, mountaineering, and extreme environments — rather than purely decorative sport watches. Within Prospex, both the HBB002 and HBB001 fall under the "Sea" designation, grouping them with dive-focused models built and water-resistance-tested specifically for underwater use, distinct from the "Land" series (field and mountaineering watches like the Alpinist) and the "Speedtimer" chronograph series built around motorsport heritage.

Production Numbers: 8,000 vs. 9,999 Pieces

The HBB002 is the scarcer of the two, with a global production cap of 8,000 pieces tied to the PADI partnership. The HBB001 has a larger run of 9,999 pieces tied to Seiko's own 145th anniversary. Neither number is small in absolute terms, but the tighter HBB002 allocation, combined with PADI's built-in global community of certified divers, has historically translated into faster sell-through for Seiko x PADI limited editions compared to standalone brand-anniversary pieces. If scarcity and long-term collector demand matter to your decision, the HBB002's smaller run and PADI tie-in give it the edge.

Check HBB002 Availability

Price and Value: $750 vs. $595

At $595, the HBB001 is the more accessible entry point into Seiko's 2026 limited-edition lineup — a genuinely capped, 200m automatic diver for under $600 is a strong value on its own. At $750, the HBB002 asks for a $155 premium, and in exchange delivers a sapphire crystal, a ceramic bezel insert (versus Hardlex and standard bezel materials), a second included strap, PADI-branded packaging, and a tighter production run tied to a globally recognized diving organization.

Neither price should be read as better or worse in isolation — it depends entirely on which features matter to you. Buyers who plan to wear their watch daily and want scratch-resistant glass and a spare strap for diving will find the HBB002's premium easy to justify. Buyers who want the lowest-friction entry point into a genuine Seiko limited edition, or who prefer a more compact case, will find the HBB001 delivers real value at $595.

It is also worth putting both prices in context against the broader automatic dive watch market. Watches from brands like Citizen, Certina, and Hamilton in the $600-$900 range typically offer either a Swiss ETA-based movement with fewer commemorative or limited-run options, or a Japanese movement comparable to the 4R35/4R36 family without the numbered, capped-production story that drives long-term collectibility. Very few watches in this price bracket combine a proven automatic movement, genuine dive certification, and a capped production run tied to a recognizable anniversary the way either the HBB001 or HBB002 does.

Which Wrist Size Fits Which Watch?

Case sizing is the most practical, least subjective way to make this decision. The HBB002's 45mm King Turtle case (47.7mm lug-to-lug) is built for wrists roughly 6.5 inches and up — the cushion shape's tapered lugs help it wear smaller than the raw diameter suggests, but it remains a substantial watch. The HBB001's 41.7mm Samurai case (49.5mm lug-to-lug) suits a broader range, roughly 6 to 7.5 inches, and its more compact diameter makes it the safer choice if you are unsure or have a smaller wrist.

Which Should You Buy? A Decision Framework

Choose the Seiko Prospex HBB002 if:

• You are a certified diver or PADI member who wants a watch tied directly to that community
• You want a sapphire crystal and ceramic bezel at this price point
• You prefer a larger, bolder King Turtle case with real wrist presence
• You want two complete strap options — steel bracelet and silicone — in the box
• Scarcity matters to you: 8,000 pieces is a tighter run than the HBB001

Choose the Seiko Prospex Sea HBB001 if:

• You have a smaller or average wrist and want an easier daily fit
• You want the lowest-friction entry point into a genuine Seiko limited edition
• You are drawn to the "Seiko Blue" design heritage over PADI branding
• You are comfortable with Hardlex crystal in exchange for a lower price
• You are buying your first automatic dive watch and want to start under $600

It also helps to think in terms of buyer profiles rather than specs alone. Certified divers and PADI members tend to gravitate toward the HBB002 for the direct community tie-in and the second silicone strap built for actual water use. Seiko collectors building out a King Turtle or Samurai lineup will likely already have a preference for one case family over the other, which makes the decision easier than the spec sheet alone suggests. Gift buyers shopping for a milestone occasion — a graduation, a promotion, a retirement — will find either watch's "capped at X pieces" detail gives the gift a built-in story that a standard production watch does not carry, with the HBB001's lower $595 price point making it the easier gift to justify without a five-figure budget. And first-time automatic buyers who are not yet sure how much they will wear a mechanical dive watch daily may prefer to start with the HBB001's lower price and more forgiving case size before stepping up to something like the HBB002 later.

Visiting Lexor Miami to Compare in Person

Photos and spec sheets only go so far when the decision comes down to a 3.3mm difference in case diameter or how a blue ceramic bezel looks next to a two-tone aluminum one in real light. Buyers in South Florida can see both the HBB002 and HBB001 side by side at Lexor Miami's showroom before buying — comparing case size, dial color, and bracelet finishing in person rather than relying on product photography alone. Our team can walk through how each watch wears on your specific wrist size, without pressure to buy on the spot. For buyers outside of Miami, both watches ship across the 48 contiguous United States, with free shipping on qualifying orders and a 30-day return window covering unopened, unused merchandise — the same protection you would expect from an in-store purchase, extended to online orders.

Shop Both Seiko Limited Editions at Lexor Miami

Why Buy Either Watch From an Authorized Seiko Dealer

Both the HBB002 and HBB001 are capped-production limited editions, which means gray-market activity tends to increase once official stock runs low. Lexor Miami is an authorized Seiko dealer, listed directly on Seiko's official dealer locator, and every unit we sell — whether HBB002 or HBB001 — ships new with a full 3-year manufacturer's warranty, free US shipping on qualifying orders, and a free return window. A price that sits meaningfully below MSRP on either watch, or a seller who cannot confirm authorized-dealer status, is a signal to buy elsewhere.

If you would like to browse Seiko's broader catalog before deciding, the full Seiko Luxe collection at Lexor Miami includes both current-production and limited references across Prospex, Presage, and King Seiko. You can also see how these two watches compare to other 2026 releases in our roundup of 5 Limited Edition Watches to Know Right Now.

Reserve Your Seiko Prospex HBB002

Final Thoughts

Both the Seiko Prospex HBB002 and the Seiko Prospex Sea HBB001 deliver real, capped-production limited editions with genuine dive-watch engineering behind the commemorative dial design — this is not a case of paying extra for a sticker and a box. The right pick comes down to case size, crystal preference, and how much the PADI story versus the Seiko-anniversary story means to you personally.

Quick recap:

• Seiko Prospex HBB002 — PADI 60th Anniversary, 45mm King Turtle case, sapphire crystal, ceramic bezel, Caliber 4R36, 8,000 pieces, $750
• Seiko Prospex Sea HBB001 — Seiko 145th Anniversary, 41.7mm Samurai case, Hardlex crystal, Caliber 4R35, 9,999 pieces, $595

Whichever one fits your wrist and your budget, buying through an authorized dealer like Lexor Miami means the watch on your wrist is genuine, fully warrantied, and backed by real customer support before and after the sale.

Frequently Asked Questions

Which is more limited, the HBB001 or the HBB002?

The HBB002 has the tighter production run at 8,000 pieces worldwide, compared to 9,999 pieces for the HBB001. Both are individually capped and will not be reproduced once each run sells through authorized dealers.

Does either watch have a sapphire crystal?

Only the HBB002 uses sapphire crystal, with a cyclops magnifier over the date window. The HBB001 uses Seiko's proprietary Hardlex mineral crystal, which is more impact-resistant but more prone to fine surface scratches over time.

Is the HBB002 or HBB001 better for a smaller wrist?

The HBB001 is the better fit for smaller wrists at 41.7mm in diameter. The HBB002's 45mm King Turtle case wears smaller than its raw dimensions suggest, but it still suits wrists 6.5 inches and above more comfortably than the HBB001 does.

Are the movements in the HBB001 and HBB002 different?

The HBB002 uses Seiko's Caliber 4R36 (24 jewels, day/date), while the HBB001 uses the closely related Caliber 4R35 (23 jewels, date only). Both are automatic movements with manual winding, hacking seconds, 21,600 vph, and roughly 41 hours of power reserve — the practical difference between them is minor.

Which watch is the better value, the HBB001 or the HBB002?

It depends on priorities. The HBB001 offers a genuine limited edition for $595, the lower-friction entry point. The HBB002's $750 price adds a sapphire crystal, ceramic bezel, a second silicone strap, and a tighter 8,000-piece production run — features that justify the premium for buyers who want them.

Can I buy both the HBB001 and HBB002 from an authorized dealer with a warranty?

Yes. Lexor Miami is an authorized Seiko dealer, and both the HBB002 and HBB001 ship new with a full 3-year manufacturer's warranty, free US shipping on qualifying orders, and a free return window — protection that unauthorized resellers typically cannot offer.

Related Reading

• Full Seiko Prospex HBB002 Review: Specs, Price & Is It Worth It?
• Full Seiko Prospex Sea HBB001 Review: Specs, Price & Is It Worth It?
• 5 Limited Edition Watches to Know Right Now
• Browse the Full Seiko Luxe Collection