The short answer: the Blancpain 5200 is the Fifty Fathoms Bathyscaphe Chronograph Flyback, a 43.6 mm flyback chronograph rated to 300 m, and no replica sold under that name reproduces the whole package. Judge a copy on case geometry, bezel action, dial print alignment and chronograph feel, not on seller labels like "AAA" or "Swiss made" that nobody verifies. Ask for still photos plus a video of the chronograph start, stop and flyback reset, and go in knowing you are buying a copy of a design, not a Blancpain.

Start With the Real Watch's Numbers

Knowing the genuine specification tells you what a replica is even trying to imitate. The Bathyscaphe Chronograph Flyback uses a 43.6 mm case, measures a little over 15 mm thick, runs the in-house F385 automatic flyback chronograph at 5 Hz with roughly 50 hours of reserve, and carries a 300 m rating. Photographs of the real watch are easy to find on the maker's own site, so compare proportions rather than trusting a listing's headline claims.

What to Look For

Case and Bezel

Check the bezel first. On a good copy the insert sits flush, the ratchet clicks are crisp and even, and the triangle aligns with the 12 o'clock marker. Look at the crown guards for soft, rounded edges, and at the caseback engraving for shallow or blurry lettering. A case that looks flat from the side, with sharp corners on the lugs, is the fastest sign of a cheap shell.

Dial, Hands and Lume

Printed text should be sharp under magnification and centered between the date window and the dial edge. Subdial spacing matters: if the chronograph subdials sit too close together or overlap the date, the dial was made for a different movement. Lume is a giveaway too. Charge the watch under a lamp, then check it in a dark room. Weak or patchy glow after a few minutes usually means a printed dial rather than applied markers.

Movement and Chronograph Function

Ask which movement is inside and expect an honest answer. Many copies use a 28,800 vph automatic chronograph; others use a 21,600 vph unit that lacks the true flyback function. Test it yourself if you can: press the pusher while the chronograph runs to see whether the seconds hand snaps back and keeps running. A grinding or spongy pusher, or a hand that stutters, points to a poorly finished mechanism.

Strap and Clasp

Sailcloth and rubber straps on copies often feel stiff and plastic. Check the stitching, the tang or deployant finish, and whether the spring bars seat without play in the lugs.

Parameter Bands

• Case diameter: genuine is 43.6 mm; decent copies land within roughly 42.5 to 44 mm.
• Thickness: genuine is just over 15 mm; be suspicious of anything under 13 mm, which usually means a quartz or slim case.
• Lug width: about 23 mm, so aftermarket straps should be quoted in that range.
• Crystal: domed sapphire with anti-reflective coating; flat mineral glass is a cost shortcut.
• Beat rate: 28,800 vph is typical of the better automatic chronograph movements used in copies.
• Weight on strap: roughly 100 to 130 g for a steel case; a very light case often means hollow construction.
• Water resistance: assume none, even if the listing claims 300 m.

Common Pitfalls

• Marketing tiers such as "first copy" or "1:1" carry no agreed meaning and vary from seller to seller.
• Stock photos recycled across many listings tell you nothing about the actual watch in stock.
• Unrequested claims of Swiss origin for a movement that is visibly Asian in finish.
• Misaligned bezel, date or subdials that only become obvious in a video.
• Gold-tone plating that wears through at the crown and clasp within months.
• No parts source, so a broken chronograph module cannot be repaired.
• Customs risk: in the United States, importing counterfeit goods is illegal and shipments can be seized and destroyed.

FAQ

Will a replica Blancpain 5200 survive swimming?

Treat it as splash resistant. Gaskets, crown threading and caseback seals on copies are not tested to any published standard, and a claimed 300 m rating is copied text, not a measurement.

What movement is usually inside?

Most automatic chronograph copies use a 28,800 vph or 21,600 vph Asian chronograph movement. Only the better ones replicate the flyback function, so ask directly and request a video.

How much should it cost?

Prices vary too widely to give a useful number, and any seller quoting a fixed "grade" price is selling a label. Compare on movement detail, case finishing and evidence instead.

Can it be serviced later?

Usually not by a Blancpain service centre, and often not by a local watchmaker either if parts are not available. Budget for replacement rather than repair.

Will anyone mistake it for the real thing?

From across a room, possibly. In the hand, close inspection of the bezel action, dial print and caseback engraving exposes most copies. Buy with that expectation.

A Note on Legality and Value

Counterfeit watches infringe trademarks, and in the US they can be seized at import and are illegal to resell. They carry no manufacturer warranty, hold no resale value, and cannot be authenticated. If ownership of the design rather than the brand is what you want, an honest homage from a legitimate microbrand avoids every one of those problems.