A fake Fifty Fathoms chronograph is a counterfeit of the Blancpain Fifty Fathoms Bathyscaphe Chronographe Flyback, and the short answer for anyone searching that phrase is straightforward: only the genuine reference 5200 family carries the in-house movement, the factory depth rating, and authorized service, while counterfeit copies reproduce the outline of a dive watch and very little of what makes one work. The criteria that separate the two are the movement architecture, case and bezel finishing, dial text and date placement, real water resistance, and the legal exposure that follows a trademarked product.
What the genuine Fifty Fathoms chronograph actually is
Blancpain has produced the Fifty Fathoms line since 1953, and it sits inside the Swatch Group today. The chronograph versions live in two families. The Bathyscaphe Chronographe Flyback, reference 5200 series, runs the in-house calibre F385, a column wheel and vertical clutch flyback chronograph beating at 36,000 vibrations per hour with a silicon balance spring and about 50 hours of reserve, fitted in a roughly 43.6 mm case rated to 300 meters. The larger Fifty Fathoms Chronographe Flyback Grande Date, reference 5885 series, adds a big date and a beefier case. Both use sapphire crystals, unidirectional timing bezels, and signed crowns, and both are serviced only through Blancpain's own network.
Option 1: A genuine Bathyscaphe Chronographe Flyback
- Pro: the F385 is a real flyback chronograph, so the pushers reset and restart in one press instead of clicking through a generic module.
- Pro: 300 meter water resistance is tested, which matters if the watch ever meets salt water.
- Pro: resale value holds and the serial number traces back to the brand.
- Con: the entry price is high, and steel or ceramic versions trade well above most dive chronographs.
- Con: service intervals are long and expensive, and parts come only from Blancpain.
Use case: this is the pick for a buyer who wants the watch as an object, not as a look, and who plans to swim, travel, and keep it for years.
Option 2: The high end counterfeit Fifty Fathoms chronograph
- Pro: from across a table the silhouette, dial layout, and bezel can look convincing, and the cost is a small fraction of the real thing.
- Con: the movement is almost never a flyback. Most copies use a Chinese automatic chronograph or a hand wound column wheel clone, so the pusher feel, the sweep, and the subdial spacing differ from the original.
- Con: water resistance is a claim, not a test. Gaskets are frequently unsealed and a single swim can flood the case.
- Con: the watch cannot be serviced by any authorized center, has no resale market, and can be seized in transit.
- Con: buying one is illegal in the United States, and reselling one is a federal offense.
Use case: there is no honest one. If the goal is the look at a low price, a legally branded homage with its own name on the dial delivers the same styling without the risk.
Option 3: A legitimate dive chronograph
- Pro: brands such as Seiko, Tissot, Longines, and Certina sell dive style chronographs with real warranties and real depth ratings.
- Pro: parts, service, and resale all exist, and nothing can be confiscated.
- Con: the case shape and bezel font will not be a Fifty Fathoms match.
- Con: the movement is usually a modified 7750 style calibre rather than an in-house flyback.
Use case: best fit for a first serious watch, a gift, or anyone who wants to actually wear it in water.
How to tell a fake Fifty Fathoms chronograph
- Check the flyback function. Press the lower pusher while the chronograph runs. A genuine F385 resets to zero and restarts instantly.
- Look at subdial spacing. Copies shift the registers because the donor movement has a different geometry.
- Inspect the date window and font. Grande Date copies often show mismatched numerals or a wrong aperture shape.
- Weigh the case. Ceramic and titanium versions feel distinctly light, while most copies are chromed steel.
- Read the caseback engraving. Reference numbers, case metal, and depth text should match the catalog exactly.
- Ask for service history. A genuine watch has papers from an authorized center, and a counterfeit has none.
Legal and practical risk in the United States
Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320, and customs officers can seize and destroy counterfeit trademarked merchandise under 19 U.S.C. 1526. A single personal purchase usually ends in confiscation rather than prosecution, but the money is gone and the package does not arrive. Sellers face civil suits from the trademark owner on top of criminal exposure. There is also the practical side: no warranty, no parts, no service, and a watch that fails the first time it gets wet.
Bottom line
If the term you searched describes what you were about to buy, slow down. A Fifty Fathoms chronograph is defined by the F385 flyback movement, the 300 meter rating, and the case finishing, and a counterfeit delivers none of those. Buy the genuine Bathyscaphe if the budget allows, buy a legitimately branded dive chronograph if it does not, and skip the copy entirely.