Short answer
Most watches listed as an "Omega 2579" at a low price are not Omega. Omega case numbers in the 2500 range come from the early 1950s. Records for 2579 are thin in public catalogs, so a steady supply of cheap examples on marketplace sites points to fake or franken builds.
A franken watch uses a real Omega movement inside a non-Omega case, or a real case with a reprinted dial. Sellers list both as original.
What the number 2579 means
On a vintage Omega, the reference number identifies the case, not the movement. It is stamped inside the caseback. It often sits next to a second number, the case maker code. A watch can hold an Omega movement and still be fake if the case and dial are not Omega.
Fake Omega 2579 Watch Guide: Buy Real, Spot Fakes
Public 1950s Omega catalogs are incomplete. For one specific 2579, ask the seller for an Extract from the Archives. Omega runs this service and it confirms the production date and the reference that left the factory.
Fake Omega 2579: A Comprehensive Guide
Check the caseback
- Reference stamp. Vintage Omega uses stamped digits with even depth. Laser engraving is wrong for the 1950s.
- Serial number. 7 to 8 digits on 1950s pieces. Match it against Omega's published serial tables. A serial that does not fit the case style is a red flag.
- Case maker code. Standard on Swiss cases of the period. A missing or wrong code means the case is not original.
- Tool marks. Polishing removes edges and flattens lugs. Sharp case lines are a good sign.
Check the movement
Ask for a photo of the movement with the balance visible. Omega movements of this era carry the caliber number and the Omega symbol on the bridge. Look for:
- Correct caliber for the case. A later caliber inside an earlier case is a swap.
- Engraved markings, not printed ones.
- Screw slots with clean edges and no burrs.
- A rotor or bumper weight present if the watch is automatic.
Generic ETA and Chinese movements appear in many fakes. They carry no Omega mark. Some sellers photograph a genuine movement and ship a different watch.
Check the dial
Redialing is common. Signs:
- Print thicker than original, or with soft edges under a loupe.
- Wrong font for the period. Omega changed dial printing across the 1950s.
- Lume plots that do not match the hands in color or age.
- Dial feet that do not line up with the movement, which forces glue or tape.
Price and seller
Genuine 1950s Omega references sell in the hundreds to low thousands of US dollars, based on condition and paperwork. Prices far below that range are the main signal. So are stock photos, no service history, and a seller whose other listings share the same images. Replica sellers use a real reference number as a keyword to catch search traffic.
Before you pay
- Ask for high-resolution photos of the caseback interior, the movement, and the dial.
- Ask for a service record or an Extract from the Archives.
- Pay with a method that allows a chargeback.
- Have a watchmaker open the case. It takes minutes and settles most questions.