Answer first: on a Seamaster 300M reference 210, three checks expose most fakes in under five minutes. The movement behind the sapphire caseback, the bezel action and insert, and the depth of the laser-cut waves on the dial. Get those three right and you have filtered out nearly every copy. The rest, from lume to clasp screws, is confirmation.
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1. Turn it over and read the movement
The current 210 generation runs calibre 8800, a Master Chronometer with a co-axial escapement. Under the sapphire you should see a free-sprung balance with no regulator arm, openworked rotor with arabesque finishing, and bridges decorated in a wave pattern. Copies almost always hide a stock ETA 2824 clone under a screwed-on decorated plate. Look for a regulator arm, flat printed decoration rather than machined relief, and a balance cock that looks generic. Those are dead giveaways.
The NAIAD LOCK caseback engraving should be deep, sharp, and evenly spaced. The hippocampus engraving has fine line detail that reproduces badly on a fake. Serial and reference etching is shallow but crisp, and should match the warranty cards exactly.
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2. Work the bezel
A genuine ceramic bezel has a white enamel diving scale that sits flush inside the ceramic, not printed on top of it. Run a fingernail across it. Real enamel feels level with the surface. Fakes usually have a decal or pad print that catches your nail edge.
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- 120 clicks, crisp, with almost no back play
- Scalloped edge machined with sharp inner corners, not cast and rounded
- Lume pip centered at 12, seated flat, not a domed blob
- Insert gloss consistent, with no rainbow tint under direct light
3. Check the dial waves and printing
The dial is ceramic with laser-engraved waves. Tilt it under a lamp and the waves should show real depth and shadow, running horizontally across the dial. Fakes tend to have stamped or printed lines that look flat and slightly too thick.
Then read the text. "Seamaster" and "PROFESSIONAL" should be crisp, level, and correctly spaced, with the red accent a specific shade rather than a generic orange. The applied Omega logo is polished, has defined feet, and sits proud of the dial. The date at 6 o'clock should use a disc that matches the dial color, with a font that fills the window properly.
4. Look at hands, case, and crown
Skeletonized sword hands should have cleanly cut slots and flat, even lume fill. The seconds hand has a red tip that ends in a sharp, straight edge, not a painted smear. On the case, the twisted lyre lugs have a hard transition between brushed tops and polished flanks. Run a finger along it. Fakes feel soft there.
The helium escape valve at 10 o'clock sits flush with the case and threads smoothly. A fake often has it slightly proud or fixed in place. The crown should be signed and screw down without grit. Case size is 42mm and roughly 13.5mm thick, so anything noticeably thicker is suspect. Weight is a rough guide only, but a full-bracelet watch feels dense in the hand.
5. Bracelet and clasp
Link screws, not pins. The taper is gradual and the end links fit the lugs with no rattle when you flex the watch. The clasp has a push-button release plus a diver's extension, and the engraved logo is sharp with defined edges. Stamped clasps, folded steel, and loose screws point to a copy.
6. Paperwork and the METAS check
A genuine watch ships with a Master Chronometer card, pictograms card, and a five-year warranty. Serial numbers on the card, the caseback, and any service record should agree. METAS certification covers eight tests, including magnetic resistance to 15,000 gauss and a daily rate of 0/+5 seconds.
That last part matters most. Put the watch on a timegrapher and read it in several positions. A real 8800 holds a tight rate and strong amplitude. A decorated clone drifts, and it is not anti-magnetic, so a magnet test will show it fast.
Quick pre-purchase checklist
- Sapphire caseback shows a free-sprung balance and co-axial escapement
- Bezel clicks cleanly with enamel-level scale and no back play
- Dial waves show depth under raking light
- Serial matches the cards and the caseback etching is sharp
- Timegrapher numbers hold across positions
If two or three of these fail, walk away. On a 210, the movement and the bezel are the hardest things for a counterfeiter to get right, so start there and let the small details confirm what you already suspect.