What the replica Fifty Fathoms 5000 is
The keyword points to copies of Blancpain's Fifty Fathoms diver in the 45 mm case used for reference numbers that start with 5000. The genuine watch has a 45 mm steel case, a 300 m water resistance rating, a sapphire bezel insert with luminous markers, a screw-down crown, and the in-house caliber 1315 automatic with a 120-hour power reserve. Replica builders copy the case and dial, fit an Asian automatic, most often an ETA 2824 pattern movement, and sell for about $300 to $700. The gap sits in the movement, the bezel insert, and the depth of the finishing.
What the digits 5000 identify
A listing that says "5000" on its own does not name one watch. Blancpain's catalog names this line Fifty Fathoms Automatique, with case references in the 5015 group, and the smaller Bathyscaphe in the 5100 group. Ask the seller for the full reference number and the case size, then check that number against the maker's own catalog. If the seller cannot name the reference, the listing is guesswork.
Genuine numbers to compare
- Case: 45 mm steel, brushed flanks, polished lugs, thickness near 15.4 mm.
- Water resistance: 300 m, tested and sealed by the maker.
- Bezel: sapphire insert over luminous material, unidirectional rotation.
- Crystal: domed sapphire with antireflective coating on both faces.
- Movement: Blancpain caliber 1315, automatic, 4 Hz, three series-coupled barrels, 120-hour reserve, silicon balance spring.
- Date: many Fifty Fathoms Automatique references place the aperture at 4:30.
- Caseback: display back that shows the rotor and bridges.
- Strap: sailcloth or alligator on a signed buckle.
How replica builds differ
Most replicas of this model run 45 mm wide and 15.5 mm to 17 mm thick. The extra depth comes from a movement spacer and a thicker caseback shaped to copy the real profile. The movement is the main difference. A 2824 pattern unit has one barrel, a 38 to 42 hour reserve, and a 28,800 vph beat. The genuine 1315 has three barrels and a five-day reserve. Some high-grade replicas hide a plain rotor behind a decorated bridge plate that copies the look of the 1315. That plate adds height and blocks access for service.
Bezels vary by build. Better replicas use a sapphire insert with luminous material under the surface. Cheaper ones use mineral glass or printed paint. Lume on a low-cost dial fades inside an hour. A genuine dial stays readable for hours.
Checks you can run
- Wind the watch, set it, and let it rest. A 2824 build stops before 48 hours. The genuine caliber runs past 120.
- Timegrapher reading: both beat at 28,800 vph, but a worn replica shows high beat error and low amplitude.
- Measure the case with calipers. Above 15.5 mm points to a spacer and a thick caseback.
- Turn the bezel. Loose, gritty action with back-play points to a pressed insert and a low-cost ratchet.
- Hold the dial under a lamp for two minutes, then read it in a dark room.
- Study the date window. Font, height, and the 4:30 position are hard to copy at low cost.
- Check the crown engraving under a loupe. Shallow laser marks show a replica crown.
Price and service
Listings for this replica land between $300 and $700. Price tracks the movement grade, the bezel insert, and the case finishing. A 2824 pattern movement takes standard ETA parts, so a local shop can service it for $80 to $150. Blancpain services the genuine caliber 1315 through its own network alone, the job costs several hundred dollars, and the turnaround runs in weeks. A 300 m pressure test needs the maker's seal kit, so most independent shops will not certify a replica case.
Legal status in the US
Counterfeit goods fall under 19 U.S.C. § 1526 and 18 U.S.C. § 2320. Customs and Border Protection can seize an incoming package that carries a counterfeit trademark, and the buyer loses the payment. Carrier rules and shipping routes change, so treat seizure as a live risk.