Replica Constellation 131.23 covers copies of Omega's current-generation Constellation in a steel and gold case. The first three digits, 131, name the collection. The next two digits name the metal mix, so 131.23 is stainless steel with gold. Trailing digits set case size, dial color, and bracelet, which means two watches can share the 131.23 prefix and still differ in diameter. Check the full reference before you compare anything.
What the Code Identifies
Omega builds reference numbers in blocks. 131.10 is the all-steel version. 131.20 uses steel with Sedna gold. 131.23 uses stainless steel with yellow gold. Gold appears on the bezel, the claws, the crown, and the center bracelet links. The caseback and outer links stay steel.
Specs Across the Family
- Case sizes sold in the line: 25mm, 28mm, 36mm, 39mm.
- Movement: Co-Axial Master Chronometer calibres on the larger sizes, METAS certified, 15,000 gauss magnetic resistance.
- Power reserve: 50 to 55 hours, set by the calibre.
- Water resistance: 50 metres on most models.
- Bracelet: integrated, butterfly clasp, push adjustment on the larger sizes.
Not every size uses a mechanical movement. Small models in the line have used quartz calibres. Omega publishes the exact calibre and dimensions for each reference on its own site. Measure against that page, not against a seller's photo.
What Replica Listings Mean by Grade
Terms such as 1:1, Swiss ETA, clone movement, and super clone are seller language. No standards body defines them, and a listing can change grade name without changing the watch. Ask for the movement maker and the beat rate. Omega in-house calibres run at 25,200 vibrations per hour. A copy running at 21,600 or 28,800 is not a copy of the original calibre.
Checks That Matter
- Case diameter and thickness against the published spec.
- Date aperture position and font against a reference photo.
- Bezel claws: one row of polished claws, evenly spaced.
- Clasp engraving: laser-etched, not stamped deep.
- End-link fit at the case and taper along the bracelet.
- Weight. Solid 18k gold parts are heavier than plated parts.
Gold plating is a common cost cut. Genuine two-tone Constellations use solid 18k gold on the bezel, claws, crown, and center links. Plated copies show wear at the clasp edges and crown first, since those points take contact.
Price Context
Omega lists two-tone Constellation models above the steel versions. Replica sellers price copies well below retail, and the price tracks the movement more than the finish. A quartz copy and a mechanical copy can look the same in a still photo. Ask for video with the seconds hand moving and the caseback open.
Legal Note
US federal law, 18 U.S.C. 2320, makes trafficking in counterfeit goods a crime. Customs and Border Protection can seize shipments. That applies to buyers and sellers.