Short Answer
Omega's public catalog lists no movement calibre and no case reference numbered 7902. Listings that use the code 7902 come from replica sellers. Those sellers do not publish catalogs, so the code has no documented meaning outside the listing itself. A buyer looking at "Omega 7902" is reading a seller code, not a factory reference.
How Omega Numbers Work
Omega uses three separate numbering systems. Each one looks different on the watch.
- Case reference, also called a PIC. Dot-separated digit groups, for example 210.30.42.20.01.001. The number of groups changed over the decades. Vintage references such as 3570.50.00 use three groups.
- Calibre. Four digits, for example 8800, 8900 or 9900. A calibre number describes the movement inside the case, not the watch itself.
- Serial number. Eight digits on modern watches. It is stamped on the movement and on the caseback. Omega does not run a public serial number lookup.
Steps to Verify a Watch
- Read the case reference from the caseback and compare it with the Omega catalog.
- Compare the serial number on the caseback with the number on the movement. The two must match.
- Look for a Master Chronometer certificate. METAS, the Swiss Federal Institute of Metrology, issues the certificates and holds the test records.
- Ask an authorized Omega dealer, or a watchmaker with an Omega parts account, to open the case.
- For watches made before 2000, request an Extract of the Archives from Omega.
Counterfeit Markers
Replica watches fail on small details, not on the overall shape.
- Engraving on the caseback is shallow. Laser etching replaces stamped or milled text.
- Bracelet end links carry no reference stamps, or carry stamps in the wrong font.
- Movement finishing shows no Geneva stripes, no perlage, and a rotor weight in the wrong metal.
- The date window sits off center. The cyclops magnifier distorts the date instead of enlarging it.
- Lume plots glow at uneven brightness after two minutes in the dark.
Legal Position in the United States
Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320. A first offense carries up to 10 years in prison and a fine of up to $2,000,000 for an individual, or $5,000,000 for a business. Trademark owners can also file civil suits under the Lanham Act, 15 U.S.C. 1114. U.S. Customs and Border Protection seizes counterfeit shipments at the port, and the importer loses the goods and the money paid for them.
What Is Not Known
The origin of the code 7902 on replica listings is not documented. Replica factories publish no catalogs and no reference lists. No Swiss watchmaking body recognizes the number. I could not confirm any vintage or current Omega reference numbered 7902.