Seiko Prospex Alpinist GMT HBC007 — Green Dial Automatic GMT Watch

Authorized Seiko Dealer • Caliber 6R54 In-House GMT Movement • 39.5mm Stainless Steel Case • 200M Water Resistant • Global Debut of the Cult-Favorite Green Alpinist

$1,150.00 USD — 3-Year Manufacturer Warranty

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Introduction: The Green Alpinist GMT the U.S. Has Been Waiting Three Years For

For three years, the green-dial Alpinist GMT existed only as a Japan-exclusive reference — the SBEJ005 — forcing American collectors to either import through gray-market channels or watch from a distance while it built a cult following online. The Seiko Prospex Alpinist GMT HBC007 ends that wait. It's the global release of that same watch: a deep green sunray dial, gold-tone hands and markers, a rich brown leather strap, and the exact in-house Caliber 6R54 GMT movement found in Seiko's acclaimed black and blue Alpinist GMT models. This is arguably the most anticipated colorway in the modern Alpinist GMT lineup, and it's now available through authorized U.S. channels for the first time.

At Lexor Miami, an authorized Seiko dealer, the HBC007 gives American buyers official access to a watch that green-Alpinist fans have been chasing since 2023 — without the authenticity risk, inflated import pricing, or warranty gaps that come with gray-market sourcing. Below, we cover everything worth knowing: where the green Alpinist's design comes from, exactly what's inside the case, how it stacks up against its black and blue siblings, and why buying it through an authorized dealer protects both your investment and your peace of mind.

The full package: green sunray dial, gold-tone indices, red-tipped GMT hand, date window, and the in-house Caliber 6R54 automatic movement.

The History Behind the Green Alpinist: From SARB017 to HBC007

Green has been the Alpinist's signature color since long before this GMT existed. Seiko's beloved SARB017, produced from 2006 to 2017, paired a green sunray dial with gold-tone hands and cathedral markers — a combination so well-loved it became one of the most sought-after discontinued Seiko references on the secondary market, regularly trading well above its original retail price. When Seiko modernized the Alpinist line in 2020 and later introduced the first-ever Alpinist GMT models in 2023, purists immediately asked the obvious question: when does the GMT get the green treatment?

The answer arrived as the SBEJ005 — a Japan-domestic-only release in October 2023 that paired the new 6R54 GMT movement with the classic green-and-gold dial combination. It became an instant grail for collectors outside Japan, fueling a steady stream of gray-market imports and reseller markups precisely because there was no official way to buy it in the United States. In 2026, Seiko finally brought that watch to international markets as the Prospex Alpinist GMT HBC007 — not as a limited edition, but as a permanent addition to the Prospex catalog, joining the black SPB379 and blue SPB377 as a third standard colorway. For the first time, American collectors can buy the green Alpinist GMT new, in-warranty, and through an authorized dealer.

Key Features of the Seiko Prospex Alpinist GMT HBC007

• True independent-hour GMT function — the red-tipped 24-hour hand sets in one-hour jumps without disturbing local time, exactly like the mechanism in far more expensive Swiss GMTs
• In-house Caliber 6R54 automatic movement with 72-hour (3-day) power reserve and manual winding capability
• Signature green sunray dial with gold-tone hands and markers — the classic Alpinist colorway dating back to the SARB017
• Rotating inner compass bezel, operated via the secondary crown at 4 o'clock
• Fixed 24-hour engraved outer bezel for quick second-time-zone reading
• Curved sapphire crystal with anti-reflective coating on the inner surface
• Screwdown crown and see-through screwdown caseback, showing off the finished movement
• LumiBrite luminous hands and indexes for visibility in total darkness
• 200m / 20 bar water resistance
• 39.5mm stainless steel case with super-hard coating, 13.6mm thick, 46.4mm lug-to-lug
• Rich brown leather strap with a tri-fold push-button release clasp

Benefits: What the HBC007 Actually Gives You

• You get the grail colorway without the gray-market risk. Until this release, buying the green Alpinist GMT new in the U.S. meant paying import markups on a watch with no manufacturer warranty backing. That problem is now solved.
• You track two time zones mechanically, with zero apps. The independent GMT hand adjusts in seconds — ideal for travelers, remote teams working across time zones, and anyone who wants a genuinely useful complication rather than a decorative sub-dial.
• You wear a genuinely versatile case size. At 39.5mm, the HBC007 fits the size range most U.S. buyers are currently gravitating toward — present on the wrist without dominating it.
• You own real in-house mechanical engineering. The Caliber 6R54 is designed and built by Seiko, not sourced from a third-party movement maker — a genuine differentiator collectors care about.
• You get a functional outdoor tool, not just a look. The rotating compass bezel and 200m water resistance mean this watch can actually be used the way its 1959 ancestor was designed to be used.
• You're covered by real warranty protection. Purchased through an authorized dealer, the HBC007 carries full Seiko USA manufacturer backing — something no gray-market import can offer.

Dial detail: gold-tone hands and wedge indices against the signature green sunray finish, with the red-arrow GMT hand front and center.

Full Specifications

Materials: The Same Rugged Foundation, a More Storied Finish

The HBC007 shares its structural DNA with the rest of the Alpinist GMT family: a stainless steel case treated with Seiko's super-hard coating for meaningfully better scratch resistance than untreated steel, and a curved sapphire crystal with an inner anti-reflective coating to keep the dial legible in direct sunlight. What sets this reference apart is the dial and strap treatment — a green sunray finish that shifts subtly with the light, gold-tone hands and hour markers rather than the more common steel-toned finish, and a brown leather strap chosen specifically to complement the warmer, vintage-inspired color story rather than the black straps used on the SPB379 and SPB377. The tri-fold push-button clasp remains identical across the family, distributing pressure evenly and closing securely without a traditional pin buckle.

Design: A Direct Line to the SARB017, Rebuilt for GMT Duty

Every Alpinist enthusiast recognizes this dial layout at a glance. The wedge-shaped luminous markers, gold cathedral-style hands, and railroad minute track are a deliberate callback to the SARB017 and, further back, the 1959 original. What's new on the HBC007 is everything required to support the GMT complication: an independently adjustable red 24-hour hand, a crisp 24-hour scale on the fixed outer bezel, and a cleanly integrated date window. The dual-crown case architecture — one crown for time-setting and winding, a second at 4 o'clock for the internal compass bezel — gives the watch a purposeful, instrument-panel character from any angle, while the warmer green-and-gold-and-brown palette reads noticeably more vintage and dressier than the black or blue Alpinist GMT models.

Angled view highlighting the sunray dial finish and the fixed 24-hour outer bezel used to read the second time zone.

Technology: The Caliber 6R54 Inside

The HBC007 runs on the same Caliber 6R54 found in the SPB379 and SPB377 — Seiko's dedicated automatic GMT movement built specifically for the modern Alpinist collection. It uses an independent-hour, "true GMT" architecture: the 24-hour hand runs on its own gear train and can be adjusted a full hour at a time without ever stopping the main hour, minute, or second hands. That's a meaningfully more useful setup than a basic "office GMT" movement, and it's the same fundamental mechanism prized in dual-time watches costing several times more.

The movement also offers hacking seconds for precise time-setting, manual winding for collectors who prefer to wind by hand, and a 72-hour power reserve that comfortably survives a weekend off the wrist. The inner compass bezel remains a fully mechanical navigation tool — no battery, no app — referenced against a topographic map and the sun's position, exactly as climbers have used compass bezels for generations.

Who Should Buy the Seiko Prospex Alpinist GMT HBC007?

• Green Alpinist loyalists who have wanted the SARB017 colorway in a modern GMT case since the SBEJ005 first launched in Japan.
• Collectors who want a distinctive Alpinist that stands apart from the far more common black and blue dial options.
• Frequent travelers who want a mechanical, independent-hour GMT for tracking a second time zone.
• Buyers who want vintage character with modern function — the green-and-gold palette wears dressier than the standard Alpinist GMT colorways while keeping full tool-watch capability.
• Anyone who previously considered a gray-market SBEJ005 import and would rather buy new, authenticated, and warrantied through a U.S. authorized dealer.
• Gift buyers looking for a distinctive, conversation-starting Seiko with real horological substance behind the color story.

Why Buy the HBC007 at Lexor Miami?

As a newly globalized release, the HBC007 is exactly the kind of watch where buying from an authorized source matters most — demand from Alpinist collectors is high, and unauthorized sellers and marketplace listings are already circulating for the "gray import" version of this watch. Lexor Miami is an official Authorized Seiko Dealer, meaning every HBC007 sold is guaranteed new, authentic, and backed by Seiko USA.

• Authorized dealer status — full Seiko USA warranty coverage, not a gray-market gamble
• 100% authentic, brand-new inventory — never refurbished, never gray-market
• 3-Year manufacturer warranty on every HBC007 sold
• Free shipping on orders $150+ and free returns within 30 days
• +3,100 five-star Google reviews and over 20 years serving collectors across the United States
• Real human support via phone, WhatsApp, and email
• Miami showroom at 2371 NW 20th St for buyers who want to see the green dial in person before committing

Comparison: How the HBC007 Stacks Up

The comparison makes the case plainly: the HBC007 delivers the same true, independent-hour GMT movement found across the Alpinist GMT family and in watches costing multiples more, wrapped in the specific green-and-gold colorway collectors have been requesting since the SARB017 era — now finally available new, in warranty, through a U.S. authorized dealer.

Luxury Lifestyle: Where the HBC007 Belongs

The green-and-gold palette gives the HBC007 more range than its black and blue siblings. On the trail, the compass bezel and 200m water resistance make it every bit as capable a field companion. Off the trail, the warmer tones and vintage-inspired dial read closer to a heritage dress watch than a sports tool — equally at home with a field jacket on a weekend hike or with tailoring at a dinner reservation. That crossover appeal is exactly why the SARB017 built such a devoted following in the first place, and why its modern GMT successor has been one of the most requested releases among Seiko collectors for the past three years.

Styled off the wrist — the green sunray dial and brown leather strap lean noticeably more vintage than the black and blue Alpinist GMT models.

Frequently Asked Questions

Conclusion

The Seiko Prospex Alpinist GMT HBC007 closes a three-year gap between what collectors wanted and what was actually available in the United States. It takes the most beloved Alpinist colorway in Seiko's history — the green-and-gold combination that made the SARB017 a modern classic — and pairs it with the same true, independent-hour GMT movement found in the acclaimed SPB379 and SPB377. The result is a watch with genuine heritage, genuine mechanical substance, and a look that stands apart from every other GMT in its price range. Bought through an authorized dealer like Lexor Miami, it also comes with the manufacturer warranty and authenticity guarantee that gray-market imports of the old SBEJ005 could never offer — making this one of the most compelling Seiko releases of the year.

Explore More at Lexor Miami

• Seiko Prospex Alpinist GMT HBC007 — Product Page
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