Answer

No Omega watch carries both names. The Seamaster Aqua Terra is rated to 150 m. The Seamaster 300M Diver is rated to 300 m. Replica sellers merge the two names into one keyword. When a listing reads Aqua Terra 300M, ask for the case reference before you pay. The seller ships one case shape, not two watches.

Aqua Terra vs. Seamaster 300M Diver

  • Aqua Terra: 38 mm and 41 mm cases, 150 m water resistance, teak deck dial lines, no helium valve, Master Chronometer calibers 8800 and 8900, 15,000 gauss magnetic resistance.
  • Seamaster 300M Diver: 42 mm case on older references, 41 mm on current ones, 300 m rating, helium escape valve at 10 o'clock, ceramic dial with a wave pattern, calibers 8800 and 8912.
  • Both lines use sapphire crystals and screw-down crowns. The diver adds a rotating bezel and a helium valve.

Movements in Replicas

Replica cases hold four movement families.

  1. Miyota 8215: 21,600 vph, 40-hour power reserve, no hacking.
  2. Miyota 9015 and Seagull ST2130: 28,800 vph, hacking.
  3. Hangzhou 6460 and other ETA 2824 clones.
  4. Chinese automatic movements with a rotor plate stamped to copy an Omega 8800.

A genuine 8800 or 8900 has a co-axial escapement and METAS certification. No replica movement holds that certification. Sellers label clones as Swiss ETA. Ask for a photo of the balance wheel and the rotor bridge.

Case, Crystal, Water Resistance

Most replicas use 316L stainless steel. Some listings claim 904L. Ask for a weight in grams. A 41 mm steel Aqua Terra on a full bracelet weighs about 150 g to 160 g with links fitted. Sapphire crystals with anti-reflective coating appear at the mid tier and above. A 300 m claim comes from marketing text, not from a pressure test. Case gaskets, crown threads, and case-back seals differ from the genuine parts. The helium escape valve on replica divers is a cap in most samples.

Price Tiers

  • $80 to $150: mineral glass or low-grade sapphire, 21,600 vph movement, stamped clasp.
  • $300 to $500: sapphire crystal, 28,800 vph clone, solid end links, closer dial print.
  • $600 and above: decorated movement, closer case profile, AR coating on both faces.

Common Flaws

  • Date font and date window position.
  • Lume color and lume duration. Replica lume fades in 20 to 40 minutes.
  • Crown action and thread pitch.
  • Bracelet end link fit at the lugs.
  • Bezel click count on diver models. The genuine bezel has 120 clicks.
  • Clasp engraving depth.

Legal Status in the United States

Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320. U.S. Customs and Border Protection can seize and destroy shipments of counterfeit watches, including single-item personal imports. Omega does not service replicas, and no parts department sells components for them. Resale value is near zero. Online marketplaces remove listings for counterfeit goods. A replica fails on each of these points.