Short answer

A fake De Ville Trésor Co-Axial Master Chronometer is a copy of Omega's hand-wound dress watch. It copies the case, the dial text and the strap. It does not copy the movement, the METAS certificate or the 15,000 gauss antimagnetic rating. Street prices sit between $120 and $700. No replica carries a valid Master Chronometer certificate.

What the real watch is

Omega sells the De Ville Trésor as a thin dress watch. The 40 mm Co-Axial Master Chronometer version runs on a hand-wound movement. Omega lists calibre 8910 for steel references such as 435.13.40.21.03.001, with a 72 hour power reserve. Case height is near 10.6 mm. Cases come in steel, Sedna gold and Canopus gold. Some dials carry diamond markers. Reference numbers and specs change by year, so check the current Omega product page before you compare a replica to a photo.

What Master Chronometer means

Master Chronometer is a certification from METAS, the Swiss Federal Institute of Metrology. The protocol has eight criteria. Two matter for buyers: a daily rate of 0 to +5 seconds per day, and function in a magnetic field of 15,000 gauss. Omega issues one certificate per watch. The certificate ties to the movement serial number. Replicas have no such record.

How sellers label replicas

Sellers use grade labels: AAA, 1:1, Swiss made, super clone. The label is marketing, not a standard. Most replicas of this model use a Chinese hand-wound or automatic movement behind a decorated plate. Some use a Miyota or Seiko base. None of these movements pass a METAS test. Price bands look like this:

  • $120 to $250: basic copy, printed dial, mineral glass.
  • $250 to $450: better case, sapphire glass, closer dial typography.
  • $450 to $700: high tier, decorated movement, extra caseback engraving. Still no certificate.

Checks a buyer can run

  1. Measure the case height. A thick case is a tell. The genuine watch sits near 10.6 mm.
  2. Read the dial text. Look at the Omega symbol, the Co-Axial Master Chronometer line and the spacing between them.
  3. Turn the crown. A hand-wound movement winds smooth and stops at full tension. Grit or a free spin points to a low grade movement.
  4. Check the caseback. Genuine sapphire backs show Geneva stripes, blued screws and an engraved serial on the movement.
  5. Ask for the serial. Omega offers a certificate request tied to the serial number. A serial that returns nothing is a problem.
  6. Weigh the watch. Gold references weigh more than steel. A plated case weighs less than solid gold.

Limits of any guide

Photos hide small defects. A gauss test and a timing machine need a watchmaker. Magnetic resistance claims cannot be verified by hand. If a seller cannot supply the serial, the reference or a return window, treat the deal as unknown. In the US, import and sale of counterfeit watches is illegal. Customs can seize the parcel.

Bottom line

A replica can look close in a photo and still fail on the movement. The Master Chronometer part of this name is the part a copyhouse cannot reproduce. Buy the certificate, not the label.