Short answer

No current Omega Seamaster reference number ends in 128. Omega uses six-digit codes plus a suffix, such as 210.30.42.20.03.001 for the Diver 300M in 42 mm steel, and 215.30.44.21.01.001 for the Planet Ocean in 44 mm steel. Vintage Seamaster cases from 1957 to 1970 use four or five digits, such as 2846, 14701, and 166.010. A 128 in a marketplace title is a stock number, a photo ID, or a typing error. It is not a model name.

Reference formats Omega has used

  • Modern Diver 300M: 210.30.42.20.03.001, 42 mm, steel.
  • Planet Ocean: 215.30.44.21.01.001, 44 mm, steel, 600 m rating.
  • Aqua Terra: 220.10.41.21.03.001, 41 mm, steel.
  • Vintage: 2846 (1957), 14701 (1962), 166.010 (1966).

Omega's published reference tables do not list a 128. Buyers who see 128 in a listing are reading a seller label.

What a replica Seamaster contains

Replica Seamaster watches sell for $80 to $600. Most use a Chinese automatic movement: a Seagull ST6, a Miyota 8215, or a clone of the ETA 2824 or 2892. Cases are 316L stainless steel. Sapphire crystals appear above the $150 level; mineral glass sits below it. Water resistance claims are common and unverified. A replica sold with a 300 m rating has no pressure test and no gasket standard in most cases. Helium escape valves on replicas are decorative. The bezel insert is a coated aluminum or printed ceramic part. Lume is weak. Bracelets under $200 use hollow end links and stamped clasps. Case thickness runs 1 mm to 2 mm over the real watch. Date wheel fonts differ at 10x magnification. The caseback engraving is laser-etched, not stamped.

Legal status in the United States

Counterfeit watches are illegal to import and sell in the United States. 18 U.S.C. 2320 sets penalties of up to 10 years in prison for a first trafficking offense and 20 years for repeat offenses. U.S. Customs and Border Protection seizes counterfeit watches at ports and destroys them. A buyer who orders one from overseas can lose the goods with no refund. Omega is owned by Swatch Group and enforces its marks. Selling a counterfeit as a real watch is a separate fraud offense.

Checks before buying any Seamaster

  1. Match the reference against Omega's official site or a service record.
  2. Ask for the movement number and a photo of the caseback.
  3. Check case diameter and lug width against published specs.
  4. Confirm the seller states the watch is not genuine and accepts returns.

If a listing cannot name the case reference, the movement, and the diameter, the listing has no verifiable specification.

Summary

Replica Omega Seamaster 128 is a search string, not a model. There is no Seamaster 128 reference. Treat 128 as a seller code. Expect an automatic copy in a steel case, no warranty, no service network, and legal risk at import.