Short answer

Reference 5200 is the Blancpain Fifty Fathoms Bathyscaphe Chronographe Flyback. A replica Blancpain 5200 is a copy of that watch case and dial. It is not a Blancpain product and it does not carry Blancpain caliber F385. The genuine movement is a flyback chronograph with a column wheel and a vertical clutch. It runs at 36,000 vibrations per hour and holds a 50 hour power reserve. The case measures 43.6 mm and carries a 300 m water resistance rating.

What the reference number covers

Blancpain builds 5200 in a steel case and in a black ceramic case. Dial color and strap change by version. The caseback reference and serial sit on the back of the watch. Compare those numbers before you compare prices, because sellers mix reference numbers between the time only Bathyscaphe and the chronograph.

What copy listings describe

Listings for a replica 5200 name a 43 mm to 44 mm steel case, a ceramic or sapphire bezel insert, and an Asian chronograph movement. Most of those movements follow the Valjoux 7750 layout. A 7750 does not have a flyback function. Pressing the lower pusher while the chronograph runs on such a copy can stop the watch or damage the movement. Sellers do not name the movement maker. Ask for a photo of the movement and of the caseback engraving.

Price bands for copies run from about 300 to about 900 US dollars. Price tracks the movement and the case finish. Low end copies use mineral glass, painted bezel markers, and a pressed caseback.

Points to check

• Flyback test: one push of the lower pusher resets and restarts the chronograph on the genuine watch. A 7750 copy cannot do this.
• Caseback: most versions of 5200 use a sapphire display back and an engraved rotor. Many copies use a solid back.
• Subdial spacing: the F385 layout differs from the 7750 layout. Measure the distance from the center and compare with photos of the genuine dial.
• Bezel insert: genuine ceramic markers sit recessed and level. Copies show uneven fill and raised edges.
• Engraving depth: laser etched text on a copy looks flat under a loupe.

Legal status in the US

Import and sale of counterfeit watches break US trademark law. 18 U.S.C. § 2320 covers trafficking in counterfeit goods. 19 U.S.C. § 1526 lets US Customs and Border Protection seize and destroy shipments that carry counterfeit marks. CBP publishes seizure data each year. Buyers have lost shipments and brand owners have filed civil claims against sellers.

Service and parts

Blancpain service centers will not work on a copy. An independent watchmaker can swap a 7750 clone for a new one, but case, dial, and bezel parts come from the seller alone. If the seller closes, repair options drop to the movement inside.

Bottom line

A replica 5200 copies a case shape and a dial. It does not copy the flyback movement, the caseback, or the service record. Treat the reference photos of the genuine watch as the baseline for any comparison.