Short answer

Omega reference numbers that start with 131 belong to the Constellation line. A "replica Omega Constellation 131" is a counterfeit copy of one of those watches. It is not made by Omega, has no Omega serial record, and carries no warranty or service from Omega. Selling or importing it in the United States is illegal.

What the 131 code covers

Omega writes each watch as a 14-digit product code, often called a PIC. The pattern runs XXX.XX.XX.XX.XX.XXX. The first group of three digits names the collection, and 131 is the current Constellation group. The groups that follow cover case material, case diameter in millimeters, movement type, dial variant, and bracelet or strap.

Example shape: 131.10.35.20.01.001. Collectors read that as a Constellation, steel case, 35 mm, automatic movement, first dial variant, first bracelet variant. Omega does not publish a full key for each group, so part of the decoding comes from dealer catalogs and collector lists. Treat any single breakdown as a working guide, not an official standard.

What a replica of this watch is

Factories that make counterfeit Constellations work from photos and, in some cases, a genuine sample. Reported differences:

  • Case and bracelet in steel with gold plating instead of solid gold or Omega's own alloys.
  • Generic automatic or quartz movement with no Master Chronometer certification and no METAS test data.
  • Cubic zirconia or glass in place of diamonds on dials and bezels.
  • Case weight below the genuine piece. Steel grade and case thickness differ.
  • Etched or printed logos that miss the position, depth, or finish of the original.
  • No matching serial in Omega's service records.

US legal status

Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320, the Trademark Counterfeiting Act. Penalties include fines and prison terms, and the amounts rise with the number of items. Under 19 U.S.C. 1526, U.S. Customs and Border Protection can seize and destroy counterfeit watches at the border. Personal import of one copy can still end in seizure, and the buyer loses the money paid. This article describes the market. It does not recommend buying counterfeit goods.

Risks to the buyer

  • Seizure. Packages from overseas sellers are screened. A seizure letter arrives instead of the watch.
  • No service. Omega service centers decline counterfeit watches. Independent watchmakers may also decline.
  • Water resistance claims. A stated 50 m or 100 m rating on a replica is a claim, not a tested figure.
  • Parts. Crowns, gaskets, and crystals for a counterfeit case are not stocked by Omega.
  • Resale. Counterfeits sell at a fraction of the purchase price, and some marketplaces ban them.
  • Payment. Many sellers take bank transfer or crypto, which offers no chargeback.

Genuine or replica: checks

  1. Check the serial and PIC against Omega records. A dealer or Omega boutique can confirm a genuine reference.
  2. Weigh the watch. Solid gold and steel cases hit a known weight for the reference. Plated copies run light.
  3. Look at the movement through a caseback or display back. Omega automatic calibers show finishing, engraving, and a rotor marked with the caliber number.
  4. Inspect the star and the Constellation name on the dial. On a genuine dial the applied star has sharp points and clean edges.
  5. Check the bracelet end links and clasp. Genuine Omega clasps carry a stamped logo and a reference that matches the watch.
  6. Ask for the original warranty card. Omega cards carry a PIC, a serial, and a date. Cards for counterfeits are printed, not issued.
  7. Compare diamonds. Genuine diamond markers sit in cut settings. Replica markers sit in glued or rough settings.

If you want the real watch

Pre-owned Constellation models trade below list price on the secondary market. Steel and two-tone references from the 2000s and 2010s appear often. Current list prices depend on case metal, size, and diamond count. Check the Omega site or an authorized dealer for the current figure. For service history and authenticity, buy from a dealer who provides the original cards and a written return policy.