Short answer
A copy Omega Seamaster is a replica of the Seamaster Diver 300M, not a Seamaster. Two tiers exist: cheap quartz builds with mineral glass, and higher-priced automatics wrapped around ETA 2824 clones or Miyota movements. Neither one carries a METAS-certified Co-Axial Master Chronometer calibre, and in the US, importing or reselling a trademarked counterfeit is illegal. Judge the copy on its own terms, with clear eyes about what it is not.
Know the genuine spec sheet first
The real Diver 300M gives you a measuring stick. The current model runs a 42 mm case, 300 m of water resistance, a helium escape valve at 10 o'clock, a ceramic bezel with an enamel dive scale, a wave dial, lyre-shaped lugs, and sapphire on both sides. Inside sits a Co-Axial Master Chronometer calibre (8800 or 8900), certified by METAS across eight tests, rated 0 to +5 seconds per day, and resistant to 15,000 gauss. Omega publishes all of this, which means every copy defect shows up as a measurable gap rather than a matter of taste.
Finding Replica Seamaster Watches Online: A Comprehensive Guide
Movement: the biggest tell
The first thing I check on any copy is the beat rate and the winding feel. Genuine calibres beat at 25,200 vph with a free-sprung balance and silicon hairspring. Copies commonly use a Seagull ST2130 or Hangzhou 6300 at 28,800 vph, or a Miyota 8215 at 21,600 vph with a stutter on the seconds hand. Decoration plates often hide a base movement underneath. A copy can keep decent time, but it will not pass the METAS magnetic or accuracy protocol, and it will not hold that rate after a knock.
Case, crystal, dial, bezel
- Measure the case and the lug-to-lug. Genuine is 42 mm across and roughly 49 mm lug to lug. Copies drift to 41 or 43 mm with wrong proportions.
- Check the crystal tint. Domed sapphire with anti-reflective coating on both faces throws a faint blue tone and slight edge distortion.
- Read the dial under a loupe. Applied logo, sharp marker edges, clean date font, and a wave texture that catches light. Copies show fuzzy printing and a date wheel that sits off center.
- Turn the bezel. Ceramic insert, 120 clicks, no back play, scale cut into the ceramic. Cheap copies use painted inserts and mushy detents.
- Lume should glow blue (BGW9). Green or dim lume is a giveaway.
Heft, bracelet, and caseback
A steel Diver 300M on bracelet weighs close to 190 grams. Copies usually come in lighter because the case walls are thinner. The genuine bracelet uses five links, screwed pins, and a clasp with micro-adjust and an engraved logo. Copies fall back on folded links and pressed clasps. On the back, expect a sapphire display, deep rotor engraving, and a signed crown that threads smoothly. The helium valve on a copy is often fixed in place or purely decorative.
Water resistance and daily wear
The 300 m rating printed on a copy is a claim, not a test result. Gaskets, crown threads, and caseback seals on budget builds vary from batch to batch, and a pressure test can fail on a watch that already left the factory. Treat any replica as splash resistant at best. Do not swim in it, and do not take it diving.
Price tiers, honestly
- Under $100: quartz, mineral glass, painted bezel detail, stamped case.
- $150 to $400: automatic clone movement, sapphire crystal, wearable bracelet, wrong movement architecture.
- $500 and up: sold as super clone or 1:1. Sometimes a genuine ETA or a decorated clone. The price buys cosmetics, never certification.
US legal reality
US Customs and Border Protection can seize counterfeit goods at the border, and the personal-use exemption does not cover items that infringe a trademark. Selling a copy as a real Omega is trademark counterfeiting and a federal offense. There is also no Omega service, no warranty, and no parts interchange with the genuine watch.
Before you send money
- Ask for the exact movement model and beat rate.
- Ask for measured diameter, lug-to-lug, thickness, and weight on a scale.
- Request photos of the date at 1 and 31, the bezel at 12, and the caseback.
- Get the return policy in writing.
- Assume zero water resistance until proven otherwise.
If the goal is the look without the legal and service baggage, an honest homage from a house that designs its own case is the cleaner path. If you still want a copy, buy it knowing exactly which corners were cut.