Quick answer

A replica Seamaster Diver 300M is a copy of Omega's 42 mm dive watch. Copies sell for about $80 to $500. They mimic the steel case, the ceramic wave dial, and the helium escape valve at 10 o'clock. No copy uses Omega's Co-Axial Calibre 8800, and no copy ships with a 300 m depth rating. Treat a replica as a costume piece, not a dive instrument.

What the genuine watch does

Omega released the Seamaster Diver 300M in 1993. The current generation launched in 2018. Core specs:

  • Case: 42 mm stainless steel, sapphire crystal, screw-down crown.
  • Water resistance: 300 m, rated for saturation diving.
  • Dial: ceramic with laser-cut waves in black, blue, white, or gray.
  • Bezel: ceramic insert, white enamel dive scale, 120 clicks.
  • Movement: Calibre 8800, Co-Axial, Master Chronometer, 55-hour power reserve.
  • Magnetic resistance: 15,000 gauss.
  • Date: window at 6 o'clock.
  • Lug width: 20 mm.
  • US retail: about $5,900 to $6,200 on rubber or steel.

Replica tiers

Copies fall into three rough bands. Budget copies cost $80 to $150 and use a quartz or 21-jewel automatic movement. Mid-tier copies cost $150 to $300 and add a sapphire crystal and a Seiko NH35 movement. The top band runs $300 to $500 and uses a clone of the ETA 2824 or the Miyota 8215. Even at $500, the finish, the movement, and the seals differ from the real item.

Points to inspect

  • Helium escape valve at 10 o'clock. On many copies the valve is a solid plug that does not open.
  • Water resistance. Copies are not pressure tested. Do not swim with one.
  • Bezel. The genuine bezel has 120 detents and no backplay. Copy bezels feel loose.
  • Lume. Omega uses Super-LumiNova. Copy lume fades in 30 to 60 minutes.
  • Weight. A genuine steel bracelet model weighs about 190 g to 200 g. Most copies weigh less.
  • Date wheel. Check the font, the size, and the alignment in the window.
  • Caseback. The seahorse medallion and the engraving depth are shallow on copies.

Sizing and fit

The case measures 42 mm across. Lug to lug spans about 50 mm, so it wears large on wrists under 7 inches. The bracelet tapers from 20 mm at the lugs. Rubber strap versions sit closer to the wrist. Copy bracelets often use hollow end links and stamped clasps.

Legal status in the US

Federal law bars trafficking in counterfeit goods under 18 U.S.C. § 2320. US Customs and Border Protection can seize shipments and destroy them. Selling a copy as a genuine Omega is fraud. Resale value for a replica is close to zero.