The fake Fifty Fathoms 43mm is a replica built to mimic Blancpain's 43.6mm Bathyscaphe and closely related 42.3mm Fifty Fathoms references. The fastest tells are case thickness, bezel insert material, date window font, and movement finish, since most copies hide generic Miyota or ETA-clone movements under engraved rotors.
What does "Fifty Fathoms 43mm" mean in replica listings?
Replica sellers use "43mm" for watches that copy the Bathyscaphe 43.6mm, and sometimes for the 42.3mm anniversary Fifty Fathoms. Genuine references in this size range include the steel Bathyscaphe 5000-1110-B52A, which runs Blancpain calibre 1315 with a 120-hour power reserve and 300m water resistance. Copies rarely match those numbers, even when the listing claims them.
How can you tell a fake Fifty Fathoms 43mm from the real one?
Compare four areas: the case profile, the bezel, the dial and date, and the movement visible through the back. A single mismatch is often enough to confirm a replica.
Case and bezel
Genuine Bathyscaphe cases measure about 13.8mm thick with crisp, even brushing on the sides and polished bevels on the lugs. Many fakes run 14.5mm to 15.5mm thick, with softer edges and lug holes that sit slightly too high. Genuine bezels use ceramic or sapphire inserts with sharp, fully filled lume plots; copies often use aluminium, painted ceramic, or inserts with raised numerals that look slightly oversized.
Dial and date window
The Bathyscaphe dial has a small date window near 4:30 with a thin, correct font. Replica dials commonly place the date at 3 o'clock, use a wider aperture, or print "Automatique" too bold or too light. Lume is another tell: genuine Super-LumiNova glows evenly in a soft blue-green, while fakes often glow unevenly or fade within 20 minutes.
Hands and crystal
Genuine syringe hands have crisp borders and flat, even lume fill. Copies frequently show rounded tips, thick lume, or a glossy crystal with a strong blue reflection instead of the genuine near-invisible anti-reflective coating.
Movement and caseback
Blancpain calibre 1315 has three barrels, 227 parts, 35 jewels, and a silicon balance spring, finished with Geneva stripes and chamfered bridges. Most 43mm fakes use a Miyota 9015, an ETA 2824 clone, or a decorated "clone 1315" with shallow engraving and no functional silicon parts. On display backs, look for flat, laser-etched rotor text and screws that sit proud of the plates.
Which movements appear in fake Fifty Fathoms 43mm watches?
- Miyota 9015: thin, reliable, 42-hour reserve, no three-barrel architecture.
- ETA 2824 or Seagull ST2130: common in mid-tier copies, 38 to 40 hours.
- Decorated "clone 1315": cosmetic plates and rotor engraving over a basic automatic.
How much does a fake Fifty Fathoms 43mm cost?
Most replicas sell between $250 and $700 depending on movement and finishing. A genuine steel Bathyscaphe on the secondary market typically asks $9,000 to $14,000, with new retail above $15,000. A price far below those ranges for a claimed genuine watch is a strong warning sign.
Is buying a fake Fifty Fathoms 43mm legal in the US?
No. US customs law, including 19 U.S.C. 1526, allows seizure and destruction of counterfeit trademarked goods, and buyers can face civil claims. Reselling a fake with Blancpain branding carries higher risk than personal import, which is also prohibited.
What should you check before trusting a 43mm Fifty Fathoms listing?
Ask for a movement photo, a caseback photo, and a straight-on dial shot with the date set. Verify the reference number against Blancpain's catalog, then compare thickness and bezel material to published specs. If the seller refuses, treat the watch as a replica.