Short answer
The code 424.10.34 belongs to the Omega De Ville Prestige line. 424 is the family. 10 means stainless steel. 34 means a 34 mm case. A replica sold under this code copies that case size and layout. The code says nothing about the parts inside the watch.
How the reference breaks down
- 424: De Ville Prestige.
- 10: steel case and bracelet.
- 34: case diameter in millimeters.
The trailing blocks identify dial color, hands and bracelet style. Sellers who quote just the first three blocks leave the dial variant open. Ask for the full number before you compare anything.
Genuine specs to compare
De Ville Prestige builds in this size use a 34 mm steel case, a sapphire crystal, a date window at 3 o'clock, and 30 m water resistance. The movement in most Prestige references of this era is an Omega Co-Axial automatic, calibre 2500, 27 jewels, power reserve near 48 hours. Lug width and bracelet taper change with the dial variant.
Where replica builds differ
- Movement: clone 2500, Seagull ST18, or Miyota 9015. A taller movement adds case thickness.
- Crystal: sapphire on better builds, mineral glass on cheap ones. Mineral glass scratches and reflects a different color.
- Dial print: the brand text, the minute track, the date font.
- Case back: depth of the engraving and the stamped reference number.
- Bracelet: end link fit, clasp stamping, screw pins versus friction pins.
Checks before you buy
- Ask for a photo of the movement with the case back off.
- Ask for the case diameter measured with calipers.
- Confirm the date flips at midnight, not at noon.
- Ask for the weight in grams and the lug width in millimeters.
Legal status in the US
Replicas are not Omega products and carry no Omega warranty. US Customs and Border Protection can seize counterfeit watches at import. The trademark holder can file civil claims against sellers and importers. Resale inside the US carries the same exposure.