Short answer
A fake Omega Seamaster 300 41mm with a ceramic bezel copies reference 234.30.41.21.01.001, the 2021 steel model. Genuine examples list near $6,400 USD. Copies sell for $150 to $500. The gap shows in four places: the movement, the bezel action, the caseback, and the paperwork.
Genuine specs to check against
- Case: 41mm wide, 13.9mm thick, about 48mm lug to lug on the steel bracelet.
- Bezel: ceramic insert, white enamel dive scale, unidirectional, 120 clicks.
- Movement: Co-Axial Master Chronometer Calibre 8912, automatic, 60-hour power reserve, silicon balance spring.
- Water resistance: 300m. Conical screw-down crown at 3 o'clock.
- Caseback: sapphire display back with the NAIAD LOCK system and METAS engraving.
- Date: 6 o'clock window on the 2021 reference.
Movement
Every steel 41mm Seamaster 300 has a display back. Solid backs appear on fakes and on no genuine steel version of this reference.
The 8912 has a free-sprung balance with no regulator index. The rotor carries arabesque Geneva stripes, and the engraving sits deep in the metal. Replica movements include the Hangzhou 6460, the Seagull ST2130, and the Miyota 9015. The 8912 beats at 25,200 vibrations per hour. Those three clones beat at 28,800. Ask for a slow-motion video of the balance.
Case and bezel
The genuine ceramic insert is laser-engraved, then filled with white enamel. The scale sits recessed below the surface. Fake inserts use paint on top of a glossy disc, so the numerals sit flush or raised.
Bezel action: 120 distinct clicks, firm, with no play back past 12. Copies show 60 to 90 clicks, backlash, or side wobble.
Case thickness runs 14.5mm to 15.5mm on many copies because the clone movement is taller than the 8912. A scale photo in grams separates the two cases.
Dial and hands
Applied metal indexes with vintage-toned Super-LumiNova. Copies glue or print indexes, and the heights differ from index to index. The lollipop seconds hand, the applied Omega logo, and the Seamaster text sit at set depths. Ask for a macro photo of the dial at 12.
Papers and serial numbers
A genuine watch ships with a METAS Master Chronometer card and a 5-year warranty. An 8-digit serial is engraved on the caseback and stamped on the movement. Those numbers match the card. Copies ship with a card that carries a different number, or no card at all. Omega service centers will not touch a counterfeit.
Price and legal status
Genuine steel 41mm Seamaster 300 models trade near $6,400 new and $4,000 to $5,500 used, based on condition and box and papers. Copies run $150 to $500. Import of counterfeit goods into the US is illegal under 19 U.S.C. 1526, and CBP seizes shipments at ports of entry.
What a photo cannot prove
Photos do not show bezel action, lume output, or case weight. Ask for a video of the bezel turning from 12 to 12, a lume photo taken 30 seconds after charging, and a scale photo in grams. If the seller declines, stop.