Short answer
Omega reference 424.10.40.20.02.001 is a De Ville Trésor with a 40 mm stainless steel case and a leather strap. Omega assigns an 11-digit product identification code to each watch it sells. Listings for fakes copy that string and the dial layout. The digits alone prove nothing about a specific watch.
What the number encodes
Omega breaks the code into groups. 424 marks the De Ville family. 10 marks stainless steel. 40 marks the case size in millimeters. The last groups mark dial color and variant. A seller who quotes 424.10.40.20.02.001 is quoting a genuine Omega model number, not a part that Omega ever shipped to a third party.
What the genuine watch has
The Trésor 40 mm runs on calibre 8511. That movement winds by hand, uses a co-axial escapement and a silicon balance spring, and carries a 60-hour power reserve. The case has sapphire on the front and back. Water resistance is 30 m. Omega has revised dials and movements across production runs, so check the current product page before you rely on any single spec.
What replica listings for this reference show
- An automatic movement. Calibre 8511 has no rotor. If the caseback photo shows a rotor, the watch is not an 8511.
- Shallow caseback engraving. Genuine Omega marks have sharp edges and even depth.
- Case thickness above roughly 11 mm. The Trésor is a thin dress watch.
- Weight below the range for a 40 mm steel case.
- No serial number, or a serial number that does not match the card.
Points to check on any listing
- Movement type and winding. Manual wind, two barrels, no rotor.
- Dial print, applied markers, and hand finish under a loupe.
- Reference and serial numbers on the caseback, plus a matching warranty card.
- Service records from an Omega authorized service center.
Legal position in the United States
Trafficking in counterfeit goods is a federal offense under 18 U.S.C. 2320. A first conviction carries up to 10 years in prison and a fine up to $2,000,000 for an individual. U.S. Customs and Border Protection can seize counterfeit imports, including one watch shipped to a home address. Personal-use import is not the same charge as trafficking, but the goods remain subject to seizure and destruction. Omega also enforces its marks through civil suits under the Lanham Act.
Bottom line
424.10.40.20.02.001 identifies one Omega model: the steel De Ville Trésor 40 mm. The number is public and easy to copy. Verification rests on the movement, the caseback engraving, the serial, and the paper trail, not on the digits in a listing title.