Frederique Constant Classics Heart Beat Automatic FC-310MC5B6

A 40mm Swiss automatic dress watch built around Frederique Constant's signature Heart Beat open-aperture dial — a window at 12 o'clock that lets you watch the balance wheel oscillate in real time. Silver guilloché dial, Roman numerals, black leather strap, and the self-winding Caliber FC-310 movement, backed by full manufacturer warranty through an authorized dealer.

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Introduction: A Dress Watch That Lets You Watch It Work

Most watches hide their mechanics behind a solid case back, leaving you to trust that something intricate is happening beneath the dial. The Frederique Constant Classics Heart Beat Automatic FC-310MC5B6 takes a different approach: it opens a window directly into the movement, right on the dial itself, at 12 o'clock. That aperture reveals the balance wheel — the oscillating heart of any mechanical watch — ticking back and forth roughly eight times a second. It's a small design decision with an outsized effect, turning a classic silver-dial dress watch into something you can watch as much as wear.

This is one of Frederique Constant's most recognized and longest-running design signatures, first introduced in 1994 and still instantly identifiable across the brand's catalog today. The FC-310MC5B6 pairs that Heart Beat aperture with a 40mm stainless steel case, a Clous de Paris guilloché-patterned silver dial, traditional Roman numerals, and a black leather strap — a combination built for business, formal occasions, and daily wear alike. This page verifies every specification against Frederique Constant's own official listing and multiple authorized retailers, so you know exactly what you're buying before you check out.

For American buyers researching this reference online, it's worth knowing upfront that listings vary in quality and accuracy across the web. This page cross-checks every claim against Frederique Constant's own manufacturer listing rather than repeating secondhand copy, which is how we identified and corrected the moonphase/date mislabeling addressed above. Buying with accurate expectations means fewer surprises when the watch arrives and a smoother, more confident purchase overall.

The Heart Beat aperture at 12 o'clock, revealing the balance wheel in motion. View at Lexor Miami →

The History of Frederique Constant and the Heart Beat Collection

Frederique Constant was founded in Geneva in 1988 by the Dutch couple Peter Stas and Aletta Stas-Bax. The name combines the first names of both founders' great-grandparents, one of whom ran a dial-making workshop in the early 1900s — a piece of family history the brand has carried into its identity ever since. The company released its first collection, Classics, in 1992, built around clean dials, applied indexes, and open case backs that let the movement partially show through.

Two years later, in 1994, Frederique Constant introduced what would become one of its defining innovations: the Heart Beat. Rather than hiding the automatic movement entirely behind the dial, the brand cut a small aperture into the dial itself at 12 o'clock, exposing the balance wheel — the oscillating regulator that governs a mechanical watch's accuracy, and the closest thing a watch has to a literal heartbeat. The idea was as much philosophical as mechanical: to make the presence of genuine Swiss automatic engineering undeniable, visible proof that there was nothing electronic happening inside.

The Heart Beat quickly became one of Frederique Constant's most recognizable signatures, appearing across Classics references in various dial colors, complications, and case sizes ever since. Beginning in 2004, the brand started producing genuine in-house Manufacture calibers, and by 2007 had introduced non-magnetic silicon components into select movements. Frederique Constant went on to build a Tourbillon (2008), the Classic Worldtimer (2012), and a Manufacture Perpetual Calendar (2016), all engineered and assembled in-house at accessible price points relative to the wider Swiss watch industry. In 2016, Citizen Watch Co. of Japan acquired Frederique Constant, adding manufacturing resources while leaving the brand's Geneva-based design and assembly identity intact. Today, led by CEO Niels Eggerding, the company produces roughly 120,000 watches a year, still headquartered in Plan-les-Ouates, Geneva.

The FC-310MC5B6 sits within the modern Classics Heart Beat Automatic lineup — the direct descendant of that original 1994 concept, updated with a 40mm case, guilloché dial finishing, and the self-winding FC-310 caliber.

Key Features of the FC-310MC5B6

• Signature Heart Beat Open Aperture — A window at 12 o'clock that reveals the balance wheel oscillating in real time, Frederique Constant's most recognizable design innovation.
• Swiss Made Automatic Movement — Powered by the Frederique Constant Caliber FC-310, a Sellita SW200-based self-winding movement with 26 jewels.
• Approximately 38 Hours of Power Reserve — Enough to sit unworn over a weekend and still be running when you pick it back up.
• 28,800 vph Beat Rate — A standard high-grade Swiss frequency (4Hz) for smooth sweep-seconds motion and reliable regulation.
• 40mm Stainless Steel Case — Polished, with a stepped bezel, short lugs, and a case height of roughly 10mm for a comfortable, wearable proportion.
• Silver Guilloché Dial with Clous de Paris Pattern — A textured, hand-finished-look center pattern that catches and scatters light rather than sitting flat.
• Traditional Roman Numeral Hour Markers — A vintage-inspired detail that reinforces the dress-watch identity of the piece.
• Scratch-Resistant Sapphire Crystal — Protects the dial while keeping it clear and legible.
• Exhibition Case Back — A second view into the movement, this time from behind, showing the automatic rotor and gear train.
• Black Leather Strap with Pin Buckle — A classic 20mm-width strap that pairs naturally with formal and business attire.
• 50 Meters (5 ATM) Water Resistance — Rated for daily wear, hand-washing, and rain, not for swimming or diving.
• Backed by Frederique Constant's Manufacturer Warranty — Full coverage when purchased through an authorized dealer such as Lexor Miami.

Benefits: What You Actually Get With This Watch

Full Specifications

Specifications verified directly against Frederique Constant's official product listing for FC-310MC5B6. This reference does not include a moonphase display or a date function — those functions belong to a related but different reference (FC-335 caliber).

Materials: What the Watch Is Actually Made Of

The FC-310MC5B6's case is built from polished stainless steel — a material chosen for its resistance to corrosion, its ability to hold a mirror finish for decades with minimal upkeep, and its substantial, reassuring weight on the wrist without tipping into heaviness. The stepped bezel and short lugs are details typically associated with more traditional, vintage-oriented case architecture, keeping the watch's silhouette compact even at 40mm.

The crystal is sapphire, among the hardest optically clear materials used in fine watchmaking, chosen specifically to protect the dial's guilloché detailing from scratches over years of wear. The case back is also sapphire, allowing a second, unobstructed view of the FC-310 movement from behind. The strap is genuine black leather, a material selected to complement the dress-watch identity of the piece and pair naturally with formal attire, secured by a stainless steel pin buckle that matches the case finish.

Every material choice here serves the watch's dual identity as both a formal dress piece and a display object. Stainless steel and sapphire are chosen for longevity and legibility rather than novelty, while the leather strap is the one component built to be replaced over the watch's lifetime — a normal part of mechanical watch ownership, and one Lexor Miami's team can help source when the time comes.

Case profile — polished stainless steel with a stepped bezel and black leather strap. View at Lexor Miami →

Design: A Dial Built Around Its Own Movement

The FC-310MC5B6's design starts from an unusual premise: build the dial around a window into the mechanism, rather than treating the movement as something to conceal. The Clous de Paris guilloché pattern radiates out from that Heart Beat aperture, adding texture and visual depth to the dial's silver finish without overwhelming the traditional Roman numeral hour markers positioned around the edge. The 40mm case, with its stepped bezel and short lugs, keeps the overall silhouette compact and classically proportioned rather than oversized.

Polished hands and applied markers catch light against the textured dial center, keeping the watch legible without relying on bold color or heavy contrast — the FC-310MC5B6 communicates its detail through finishing rather than visual noise. The black leather strap continues that restrained design language, tapering toward a stainless steel pin buckle that echoes the case's polished finish.

Technology Inside: The Caliber FC-310 Heart Beat Movement

The Frederique Constant Caliber FC-310 is a Swiss automatic movement built on the Sellita SW200 base architecture, finished, assembled, and regulated by Frederique Constant, with a module integrated to expose the balance wheel through the dial's open aperture. As a self-winding movement, an oscillating rotor inside the case winds the mainspring using the natural motion of your wrist throughout the day — no manual winding required with regular use, and no battery to replace.

With 26 jewels reducing friction at key pivot points, a 28,800 vph beat rate, and an approximate 38-hour power reserve, the FC-310 is built for realistic daily wear. What sets it apart visually is the Heart Beat module: rather than keeping the balance wheel entirely hidden beneath the dial, Frederique Constant routes a small aperture at 12 o'clock directly over it, so the regulating organ — ticking back and forth roughly eight times per second — is visible during normal wear, not just when you flip the watch over.

Who Should Buy the FC-310MC5B6?

• Collectors who want a visible-movement watch without a full skeleton dial — the Heart Beat aperture offers mechanical transparency in a much more restrained, formal package.
• Professionals who need a classic dress watch for the office, client meetings, and formal events, with a design detail that invites conversation without shouting for attention.
• First-time Swiss automatic buyers who want genuine mechanical engineering and a distinctive design signature without committing to a five-figure watch.
• Gift buyers shopping for a graduation, promotion, or anniversary gift who want something that reads as thoughtfully chosen rather than generic.
• Fans of traditional dial design — guilloché patterning and Roman numerals are hallmarks of classic horology, well represented here.

This is not the right watch for buyers who specifically want a moonphase or date complication — the FC-310MC5B6 does not include either function. Buyers who want those complications alongside the Heart Beat aperture should look at Frederique Constant's FC-335 caliber references instead.

The FC-310MC5B6 on the wrist — a 40mm case that sits comfortably under a shirt cuff. View at Lexor Miami →

Why Buy the FC-310MC5B6 From Lexor Miami?

Anyone can list a product page. What matters is who's standing behind it. Lexor Miami is an authorized Frederique Constant dealer, which means every FC-310MC5B6 sold carries full manufacturer warranty coverage, guaranteed authenticity, and a documented supply chain straight from Frederique Constant — not a grey-market import with an unclear service history.

• 100% Authenticity Guarantee — Every watch is verified genuine before it ships.
• Full Manufacturer Warranty — Honored through Frederique Constant's official service network.
• Free Shipping on Orders Over $150 — Delivered securely across the 48 contiguous United States.
• 30-Day Return Window — Unopened, unused merchandise in original packaging, with a prepaid return label.
• Over 20 Years in the Luxury Watch and Eyewear Business — A family-owned, women-owned Miami retailer with more than 3,100 five-star Google reviews.
• Real Human Support — Reach Lexor Miami's team directly by WhatsApp, phone, or email before and after your purchase.
• A Physical Showroom — Located at 2371 NW 20th St, Miami, FL, for buyers who want to see and try the watch in person before or after ordering online.

How the FC-310MC5B6 Compares to Similar Watches

The FC-310MC5B6 competes in a specific niche: sub-$2,500 Swiss automatic dress watches with a visible or partially-visible movement and a distinctive design signature. Here's how it stacks up against the watches buyers most often cross-shop it with.

The FC-310MC5B6's clearest differentiator is the Heart Beat aperture itself — a design feature Tissot, Movado, and Hamilton simply don't offer at any price point in their comparable dress-watch lines. If you specifically want the added moonphase and date functions alongside that aperture, Frederique Constant's FC-335-based references deliver that combination at a higher price point. Explore the full range at Frederique Constant watches, Tissot watches, and Hamilton watches at Lexor Miami to compare side by side.

Luxury Lifestyle: Wearing the FC-310MC5B6

A dress watch with a visible mechanical detail occupies a specific role in a wardrobe: formal enough to disappear under a cuff at a client dinner, distinctive enough to draw a second look when someone notices the small window ticking away at 12 o'clock. The FC-310MC5B6 is built for exactly that kind of quiet, close-up luxury — not a watch that announces itself from across the room, but one that rewards attention once someone's close enough to actually look at it.

Miami's business and social calendar rewards a watch this versatile. It moves easily from a Brickell boardroom to a formal dinner without needing to be swapped out, and its 40mm case and leather strap sit comfortably under a French cuff for black-tie events. Because the Heart Beat aperture is a genuine mechanical feature rather than a printed design element, it also holds up to close inspection in a way that fashion-brand watches with "engraved" or printed detailing simply can't match — there's a real balance wheel moving under that glass every time someone looks.

Like any mechanical watch, the FC-310MC5B6 tends to accrue sentimental and functional value over years of wear, serviced periodically and, for many owners, eventually passed down. Choosing a Heart Beat piece specifically is as much a statement about appreciating visible craftsmanship as it is about the watch's immediate function. It also tends to be a strong conversation piece at events where watches naturally come up in conversation — galas, industry dinners, client meetings with fellow enthusiasts — precisely because the detail rewards a closer look rather than announcing itself immediately.

Caring for Your Frederique Constant Heart Beat Automatic

Regular wear (roughly 8 hours a day of wrist motion) is generally enough to keep the FC-310's mainspring charged through the automatic rotor. If the watch has been sitting unworn for more than a day or two and has stopped, a simple hand-wind of 20–30 crown rotations, or a couple of minutes of gentle wrist motion, will typically get it running again before you reset the time.

Because the dial features an open aperture and a guilloché-textured surface, avoid wiping it directly with abrasive cloths; a soft, dry microfiber cloth on the case and strap after wear is sufficient to keep the polished stainless steel finish sharp, particularly in humid climates. The leather strap will benefit from occasional conditioning and should be kept away from prolonged water exposure or direct sun to avoid premature cracking. As with any mechanical watch, a full service every 4–6 years by an authorized Frederique Constant service center is recommended to keep lubrication and regulation performing to spec.

The FC-310MC5B6 is rated to 50 meters, which comfortably covers rain, hand-washing, and incidental splashes, but it is not intended for swimming or diving — keep it away from prolonged submersion, and avoid operating the crown while the watch is wet.

Sizing, Fit, and Wearability

At 40mm across and roughly 10mm thick, the FC-310MC5B6 sits comfortably within classic dress-watch proportions, wearing well on wrists from about 6.25 to 7.75 inches. The stepped bezel and short lugs keep the lug-to-lug length in check even at this diameter, so the case doesn't overhang smaller wrists the way many 40mm+ sport watches with longer lugs tend to. The 20mm leather strap can be sized down at home with basic tools or professionally fitted at Lexor Miami's Miami showroom, and the stainless steel pin buckle allows for easy micro-adjustment throughout the day.

Why the Heart Beat Design Still Matters Today

Open-worked and skeletonized dials have become increasingly common across the watch industry over the past decade, but most of them go all-in: entire movements exposed, bridges and gear trains visible across the full dial surface. The Heart Beat takes the opposite approach — a single, deliberate aperture, sized just large enough to show the balance wheel and nothing more. That restraint is precisely why it still reads as a dress watch rather than a technical or sport piece nearly thirty years after its introduction.

There's also a practical argument for the single-aperture approach: it keeps the rest of the dial legible. A fully skeletonized dial can make it harder to read the time at a glance, especially under low light or from a distance. The FC-310MC5B6 keeps its Roman numerals, hour and minute hands, and overall dial layout clean and easy to read, while still delivering the mechanical transparency that skeleton-watch fans are drawn to. It's a middle path that appeals to buyers who want visible engineering without sacrificing the everyday usability of a traditional dress watch.

Frequently Asked Questions

Ready to Add the FC-310MC5B6 to Your Collection?

Whether you're drawn to the Heart Beat aperture as a design statement or looking for a genuine Swiss automatic dress watch that stands apart from typical sunray-dial competitors, the Frederique Constant Classics Heart Beat Automatic FC-310MC5B6 delivers real mechanical transparency, classic proportions, and the confidence of buying through an authorized dealer.

Conclusion

The Frederique Constant Classics Heart Beat Automatic FC-310MC5B6 carries forward one of the brand's most distinctive innovations — a dial-side window into the watch's own regulating mechanism — wrapped in a classically proportioned 40mm case, a guilloché silver dial, and a black leather strap built for daily formal wear. It's a watch that rewards close attention rather than demanding it from across a room, and a genuine example of Frederique Constant's founding mission: real Swiss mechanical engineering, priced within reach.

Purchased through Lexor Miami, an authorized Frederique Constant dealer, you get all of that backed by manufacturer warranty coverage, verified authenticity, free U.S. shipping, and a Miami-based team available to answer questions before and after your purchase. For buyers across the United States looking for a Swiss automatic dress watch with a genuinely distinctive design signature, the FC-310MC5B6 is a well-reasoned, well-verified choice.

Angled view — the FC-310MC5B6's case, dial, and strap construction. View at Lexor Miami →

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