A replica Fifty Fathoms 1953 or 5050 can look the part on a wrist, but the copies that fool people are the ones where the seller got three things right: the bezel insert, the lume color, and the caseback engraving. Everything else is easy to fake. Those three are not, which is why the good ones cost more and the cheap ones give themselves away the moment someone at the table has handled a real Blancpain.
Why the 1953 Fifty Fathoms still gets copied so much
Blancpain put the Fifty Fathoms together in 1953 for French combat swimmers, and it set the template that dive watches still follow. The name comes from the depth rating, 50 fathoms, which works out to about 91 meters. The bezel locked in place so a bump underwater could not throw off the timing. The crown screwed down. Early dials carried a moisture indicator that changed color if water got inside the case.
Most replicas nail the silhouette and miss the small stuff. The original case measured roughly 41mm, which is small by modern dive watch standards, so a copy that reads 44mm on the calipers is already wrong.
Where the 5050 fits in
The 5050 sits in the modern Fifty Fathoms Grande Date family. Bigger case, usually listed around 45mm, a sapphire-topped bezel insert instead of the old Bakelite, and a twin-window big date. That date display is the hardest thing for a factory to copy cleanly, because the two discs have to line up flush and advance at the same instant. If you are buying a 5050 replica, the date windows are your first inspection point.
Details worth checking before you pay
Bezel and insert
Turn it. A good bezel clicks through 60 positions with a firm, dry sound and almost no back play. Wobbly bezels that spin like a fidget toy are the giveaway. On 1953 style copies, check the insert material. Real Bakelite has a warm, slightly uneven gloss. Most replicas use printed aluminum or resin, which looks flat under indoor light.
Dial, hands, and lume
Compare the printing under a loupe. Genuine dials have crisp, raised markers with no bleed at the edges. Replica dials often show fuzzy lettering that thins out at the ends. Lume color is the other tell. Vintage-inspired pieces use a warm cream, while cheap copies go yellow-orange. Charge it under a lamp and see if it glows evenly; patchy glow means sloppy lume application.
Case, crown, and caseback
Crown guards should be machined, not cast. Run a fingernail along the edges. Sharp flashing means a low-grade case. Caseback engraving is where sellers get lazy: deep, crisp lettering on the genuine, shallow laser etching on the copy. Ask for a macro photo of the caseback before you send money.
Movement
Most mid-tier replicas run a Miyota 9015 clone or a Chinese automatic, and that is fine for daily wear. What matters is the beat rate and how the rotor sounds. Genuine Fifty Fathoms watches run at 28,800 vibrations per hour. If the seller claims the same, ask for a video of the seconds hand. A stuttering sweep usually means a slower 21,600 movement inside.
Water resistance, honestly
Treat the number on the spec sheet as marketing. A replica rated 300m has not been pressure tested, and the gaskets are often dry from the factory. Showering is usually fine. Swimming is a gamble, and diving is not worth the risk unless a watchmaker has opened the case, checked the gaskets, and pressure tested it.
What you should expect to pay
- Under $80: looks right in photos, wrong bezel feel, plated case, lume that dies in an hour.
- $150 to $350: the sweet spot for most buyers. Solid automatic movement, sapphire crystal, decent bezel action, reasonable dial print.
- $400 and up: high-end copies with better cases, closer lume color, and sometimes a decorated movement.
Before you send money
- Ask for a video, not photos: bezel turning, crown threading, seconds hand sweep.
- Ask for the actual case diameter and thickness in millimeters.
- Ask what movement is inside and its beat rate.
- Ask for a macro shot of the dial text and the caseback.
- Get the return policy in writing.
Bottom line
If you want the look of a 1953 Fifty Fathoms, the mid tier is where the value sits. If the 5050 Grande Date is the one you are chasing, study the date windows first, because that detail separates a convincing copy from a costume piece. Buy from a seller who answers questions with specifics, and never pay extra for a water resistance claim nobody can prove.