The fake Fifty Fathoms 1953 5050 is a replica of Blancpain's 1953 dive watch, and "5050" is a seller code used in replica catalogs rather than an official factory name. If you are shopping one, judge it on four points: case size and profile, bezel action, dial and lume accuracy, and the movement inside. The rest is listing copy.

What the Original Watch Is

Blancpain introduced the Fifty Fathoms in 1953 as a purpose-built dive watch, and it is widely grouped with the first modern dive watches thanks to its rotating bezel, high-contrast dial, and water resistance built for professional use. Early examples were issued to French Navy combat swimmers, which is why the 1953 model is treated as a milestone piece by collectors.

The original runs about 41mm across, with a black dial, large luminous markers, a rotating bezel, and a domed crystal. Re-editions from Blancpain kept that silhouette but added modern movements, sapphire crystals, and updated finishing.

Where the 5050 Label Comes From

Blancpain reference numbers for Fifty Fathoms models sit in the 50xx range, so replica sellers borrowed the pattern and started grouping the 1953-style build under a short numeric code such as 5050. Treat it as a catalog tag that tells you what shape and dial you are getting, not as proof of a specific factory or a specific movement.

Two sellers can both advertise a "5050" and ship very different watches. Always confirm the case diameter, the movement model, and the actual photos of the unit you are buying.

Details to Check Before You Buy

  • Case size and thickness: the 1953 look depends on a 41mm case with a slim profile. A 38mm case or an extra-thick midcase changes the whole watch.
  • Bezel: it should turn with firm, even clicks and line up at 12. Loose or gritty bezels are the most common weak point.
  • Dial printing: compare font weight, spacing, and marker shape against clear photos of the real piece. Blurry or too-bold text stands out at arm's length.
  • Lume: applied markers should sit level and glow evenly. Pale green or gray lume that barely charges is a sign of a low-end build.
  • Crystal: a domed sapphire with inner anti-reflective coating reads closest to the original. Flat mineral glass looks wrong from the side.
  • Case back: engraving depth and text placement vary a lot. Compare photos rather than trusting a description.
  • Crown and lugs: drilled lugs and a correctly sized crown matter if you plan to swap straps.

Movements You Will See

Most Fifty Fathoms 1953 replicas run one of three movements: a Miyota 9015 or 9039, a Seiko NH35, or a clone of an ETA 2824. The Miyota and ETA-style options beat at 28,800 vibrations per hour and give a smoother sweep. The NH35 runs at 21,600 and is the easier of the three to service or replace, which matters for long-term ownership.

Ask for the movement model in writing. A decorated rotor does not tell you what is underneath it.

Water Resistance Realities

Printed depth ratings on replica listings are claims, not test results. Cases are often assembled without pressure testing, and gaskets may be dry or poorly seated. Rinse the watch after contact with sweat or salt, keep the crown fully screwed down, and avoid swimming unless a watchmaker has actually pressure tested it.

Price Tiers and What They Buy

  1. Entry tier: basic case finishing, mineral glass, low-grade movement, and a stamped clasp.
  2. Mid tier: sapphire crystal, better bezel action, a Miyota or NH35 inside, and cleaner dial work.
  3. Top tier: closest case geometry, sharp dial printing, reliable lume, and a movement that a local watchmaker will work on.

Red Flags

  • Listing uses only stock manufacturer images with no real photos of the actual watch.
  • Claims of Swiss origin at a price that cannot support one.
  • Case diameter listed vaguely, or a small case marketed as the 41mm look.
  • No mention of the movement model.
  • Glued-on markers, uneven lume, or a bezel that does not click.

Care and Longevity

Have the watch serviced or at least regulated and pressure checked within the first year if you wear it often. Keep it away from strong magnets, avoid hot water and steam, and store it on a soft surface so the crystal and bezel insert stay clean. A well-chosen Fifty Fathoms 1953 replica can last years when the movement is standard and parts are available.