Short answer

431.10.44 is a fragment of an Omega reference, not a full model number. Omega prints references in six groups: 431.10.44.21.01.001. The first group names the collection, 431 for De Ville Prestige. The second names case and bracelet material, 10 for a stainless steel case and a stainless steel bracelet. The third gives case diameter in millimeters. The last three groups cover movement, dial, and version. A watch sold as a "fake de Ville 431.10.44" matches a prefix, not one model. Ask the seller for the full six-group reference and check it against Omega's own reference lookup.

How to read the number

  • 431: De Ville Prestige line.
  • 10: steel case, steel bracelet. A leather-strap De Ville uses a different pair.
  • 44: case diameter, 44 mm.
  • Fourth pair: movement family.
  • Fifth pair: dial color and marker type.
  • Sixth pair: production variant.

One caveat. Omega's current De Ville Prestige catalogue lists 39.5 mm, 40 mm, and 41 mm cases. I could not confirm a 44 mm De Ville Prestige. A 44 group may belong to another De Ville line or to a model that has left the catalogue. Confirm the full reference in Omega's database before you compare parts. A seller who cannot supply six groups has no paperwork trail.

What replicas copy

On a 41 mm De Ville Prestige, replicas copy the case profile, the Roman numerals or baton markers, the date window at 3 or 6 o'clock, and the three-link bracelet. Photos at 800 px hide most faults. The faults show at the bench, with calipers and a timegrapher.

What to measure

  1. Case diameter. Calipers, not a ruler. Steel De Ville cases sit between 39.5 mm and 41 mm. A replica off by 0.3 mm is wrong.
  2. Case thickness. Replicas run 0.5 mm to 1.5 mm thicker than the genuine case. Measure the mid-case, crown excluded.
  3. Weight. Weigh the watch with every bracelet link fitted. A steel De Ville on a full bracelet falls in the 120 g to 150 g band, set by the exact reference. A light bracelet is the first tell. Use the figure for the full reference, not a general number.
  4. Beat rate. A timegrapher reads rate in vibrations per hour. Omega 8500 and 8900 movements run at 25,200 vph (3.5 Hz). ETA 2824 clones used in replicas run at 28,800 vph (4 Hz). The reading settles the movement question in 30 seconds.
  5. Power reserve. 8900-series movements run about 60 hours. A 2824 clone runs about 38 hours.
  6. Crystal. Omega etches a small omega symbol at the center of many sapphire crystals. Look with a loupe at an angle, under a lamp.

Movement and caseback

Genuine Master Chronometer De Ville models carry METAS certification: 0 to +5 seconds per day, and 15,000 gauss magnetic resistance. The balance is free-sprung with a silicon hairspring. The rotor shows Geneva waves and blackened screws. Replica movements show a stud carrier and a regulator arm on the balance cock, no silicon spring, and a flat rotor finish. Check the serial. Eight digits, stamped on the movement and on the caseback. Omega can verify it.

Paperwork and price

A genuine steel De Ville Prestige on a bracelet retails near $5,000 to $6,500 new, and trades used near $3,000 to $4,500. Replicas sell from $100 to $700. A METAS card and a matching serial carry value on the genuine side. A replica with a "certificate" has a printed card, not a certified movement.

One legal note. US Customs and Border Protection can seize counterfeit watches at import under 19 U.S.C. 1526.