Seamaster Diver 300M 42mm, Green
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Authentication
Mechanically and structurally this is the black 210.30.42.20.01.001 in a different colour, so the tells for any current Seamaster Diver 300M apply unchanged. What is specific to this reference is that both the dial and the bezel insert are ceramic, which behaves differently from paint and from aluminium when it is damaged or replaced.
- The dial itself is polished green ceramic with the waves laser-engraved into it, not printed on a brass base. A dial that shows the flat, slightly grainy look of paint under a loupe is not this reference’s dial.
- Green is the premium colourway in this family, which makes a repainted or swapped bezel insert on a cheaper reference the obvious thing to check for.
- Ceramic is hard but brittle: it resists scratching far better than aluminium and chips rather than scuffs when it takes a real knock. A green insert with soft scratches and no chips is worth a second look.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Laser-engraved waves in ceramic | Waves are cut into a polished ceramic surface and catch light at a different angle from the flat areas around them | A printed or transferred wave pattern sitting on top of the dial surface, or waves whose depth is uniform under raking light |
| case | Bezel insert colour through a chip | Ceramic is coloured through its whole thickness, so any chip shows the same green underneath | A different colour or a pale substrate visible at a chipped edge, which indicates a coated insert rather than ceramic |
| movement | Caliber 8800 and Master Chronometer certification | METAS-certified 8800 with a 55-hour reserve; the certificate card carries a number that matches the watch | A missing certificate on a watch presented as full-set, or a reserve well short of 55 hours from full wind |
| crown | Screw-down crown and helium escape valve | Crown threads down cleanly, and the helium valve at 10 is present and operates; the 300m rating depends on both | A crown that will not seat, or a valve that turns without resistance |
- Bezel inserts are replaced after damage. On a green reference this is also the swap that changes what the watch is worth, so ask when and by whom.
- Bracelet clasps and the diver extension are ordinary service items; confirm Omega markings.
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Buying guidance
Wears like
Closest by lug-to-lug, thickness and width, which is what decides how a watch sits, rather than by brand or price. Family members are excluded.
- Bell & Ross BR 03-92 Steel50mm lug-to-lug · 13.25mm thick · 42mm wide · almost identical on the wrist
- Bell & Ross BR 03-92 Skull Steel50mm lug-to-lug · 13.25mm thick · 42mm wide · almost identical on the wrist
- Omega Seamaster Diver 300M 007 Edition49.6mm lug-to-lug · 13.48mm thick · 42mm wide · almost identical on the wrist
- Vacheron Constantin Overseas Chronograph50mm lug-to-lug · 13.7mm thick · 42.5mm wide · almost identical on the wrist
Drawn from the 651 of 790 references that have all three measurements recorded. Why the other 139 are missing.
Pre-purchase sheet → The numbers to check, what to look at and what to ask, on one printable page.