Short answer
424.10.40.20.02.001 is an Omega reference number in the De Ville family, and Trésor points to Omega's thin dress-watch line. The number by itself proves nothing. Omega's reference system is an internal cataloging code, and anyone copying a case can copy the code stamped on the back of it. If you are trying to identify this watch or buy one, treat the reference as a starting point, then verify the watch, the serial, and the paperwork with Omega.
How to read the reference blocks
Omega reference numbers are built from dot-separated blocks that narrow down the family, the case material, the case size, the movement group, the dial, and the production variant. Omega does not publish a full public decoder, so the readings below are conventions, not a guaranteed translation.
- Read the first block, 424. It places the watch in the De Ville collection.
- Read the second block, 10. It indicates the case material, in this case stainless steel.
- Read the third block, 40. It gives the case diameter in millimeters.
- Read the fourth block, 20. It points to the movement group.
- Read the fifth block, 02. It identifies the dial color, here a light or silver tone.
- Read the sixth block, 001. It marks the specific variant inside the group.
- Confirm your reading with an Omega boutique or authorized dealer before you rely on it.
How to verify that one specific watch is genuine
- Ask the seller for the serial number and write it down.
- Compare that serial with the engraving on the caseback and on the movement.
- Check the reference and serial against Omega records through a boutique or authorized service center.
- Inspect the dial printing under magnification and check that applied markers and text have crisp edges and even depth.
- Examine the crown, the case finishing, and the end links for tool marks and mismatched brushing.
- Have a watchmaker open the caseback and check the movement finish, engraving, and jewel count.
- Compare the watch against the exact reference in Omega's catalog, not against a similar model.
- Get the result in writing before you pay.
Why 1:1 super clone claims fail on this model
A dress watch in this family is thin, and a thin case exposes shortcuts. Plated base-metal cases lose color at the edges and on the lugs. Movements assembled from generic parts run at a different beat rate and rest in different positions. A counterfeiter can stamp a reference number into a caseback, but cannot reproduce Omega's serial ledger, its service history, or the finish on a movement it does not make. The legal side matters too: selling or shipping a counterfeit watch is trademark infringement, and shipments are seized at the border.
What to do if you are offered one
Walk away from a seller who will not let a watchmaker open the case. If you already own a suspect watch, take it to an Omega service center for a written assessment. If you believe you were sold a counterfeit, keep the listing, the payment record, and the messages, then report the seller to the platform and to the brand's anti-counterfeiting team.