Quick answer
A replica of the Blancpain Fifty Fathoms Bathyscaphe ref. 5200 copies a Flyback chronograph that Blancpain introduced in 2014. Most sellers ship a 43.5 mm steel case, a ceramic bezel insert, a sapphire crystal, and an Asia 7750 chronograph movement. The genuine watch measures 43.6 mm, uses the in-house calibre F385, and carries a 300 m rating. The copy shares the look. It does not share the movement, the finishing, the water resistance, or the service network.
Genuine ref. 5200 specs
- Case: 43.6 mm in steel, titanium, or ceramic. Thickness is about 15 mm.
- Water resistance: 300 m.
- Movement: calibre F385, automatic, column wheel, vertical clutch, flyback, silicon balance spring.
- Frequency: 5 Hz, or 36,000 vibrations per hour. Power reserve: about 50 hours.
- Crystal: sapphire. Bezel: ceramic insert. Crown: screw down.
- Dial: sunburst finish with chronograph counters and a date window.
What copies change
Case size on copies sits between 43 mm and 44 mm. Thickness runs 15 mm to 16 mm, which is more than the original because the 7750 chronograph module adds height at the caseback. Bezel inserts on low priced copies use aluminum or coated steel in place of ceramic. Crystal on the cheapest builds is mineral glass, and it scratches. Dial finishing on copies is matte or printed where the original has a sunburst effect. Date font, marker size, and hand shape differ in small ways that photos show at 2x zoom.
Movement differences
The genuine F385 beats at 36,000 vph. Most copies beat at 28,800 vph, or 4 Hz. A timegrapher shows the difference in 30 seconds. Flyback is the second tell. On the original, a single press of the lower pusher stops, resets, and restarts the chronograph. On copies, the lower pusher stops and resets, then the upper pusher restarts the run. Ask the seller to describe the pusher sequence in writing.
Checkpoints before you buy
- Measure the case. Ask for a photo with calipers. 43.6 mm is the target number.
- Request a timegrapher photo. A reading near 28,800 vph points to a 7750 base.
- Ask for the pusher sequence. A real flyback does the reset and restart in one press.
- Check bezel alignment. The triangle at 12 o'clock should sit on the marker.
- Check the caseback. Reference numbers on copies often use the wrong font or spacing.
- Ask about pressure testing. A dial that says 300 m means nothing without a test.
- Ask for a movement photo. Decoration plates, rotor engraving, and screw heads show the build level.
Water resistance and repair
A copy marked 300 m may fail at 30 m. Gaskets in cheap builds are thin, dry, or missing. A local shop can run a dry pressure test for a small fee. Repair is the second problem. Blancpain does not service counterfeit watches. Watchmakers with 7750 parts can swap a movement or reset a keyless works. Parts for the F385 are not sold outside the brand.
US legal status
In the United States, trafficking in counterfeit goods is a federal crime under 18 U.S.C. § 2320. A first offense carries up to 10 years of imprisonment. U.S. Customs and Border Protection seizes counterfeit shipments at ports and can destroy the goods. Buying from an overseas seller adds seizure risk on the shipment.
Price range
Listings for the replica 5200 run from about $120 to $450. Builds with a sapphire crystal, a decorated 7750, and a ceramic insert sit near the top of that range. Prices above $600 for this reference are uncommon. A genuine steel ref. 5200 sells for five figures, new or used.