Short answer
131.20 is an Omega reference prefix, not a model name. It marks a Constellation case in steel and Sedna gold, an 18K rose gold alloy. A replica that carries this reference is a copy of a two-tone Constellation, most often the 39 mm version. The genuine watch uses calibre 8800, a Master Chronometer movement rated to 15,000 gauss and 0/+5 seconds per day.
How to read the reference
Omega builds reference numbers in blocks. The first digits carry case material. 131.10 is steel. 131.20 is steel with gold. Gold cases use other prefixes. The next two digits give case size in mm, then the movement family, then a dial code. A 131.20.39.20.02.001 is a 39 mm steel-gold Constellation with a silver dial. Replica sellers quote the full string or a short version. Ask for the full string. The string tells you which parts should be gold and which should be steel.
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What buyers compare
- Bezel claws. Four half-moon claws hold the bezel. On the steel-gold model the claws are Sedna gold. Claw shape and the gap to the case are the first tell.
- Case thickness. Copies add 0.5 mm to 1.5 mm. Measure with a caliper, not by eye.
- Dial print. The star sits under the Omega logo. Text is thin and level. Check the date window at 6 o'clock for a stepped frame.
- Bracelet. Links taper toward the clasp. End links sit flush against the case. Look at the pin and screw heads.
- Movement. A clone of the 8800 is rare. Most replicas use a decorated 2824 or a Miyota. Ask for a photo of the balance and the rotor engraving.
- Weight. Gold alloy adds mass. Ask for a scale photo of the watch on the bracelet.
Price bands
Replica sellers do not publish prices. Buyer reports group steel-gold Constellation copies in three bands: under $150, $200 to $400, and above $400. The $200 to $400 band holds the largest number of listings with a clone or Swiss movement. Price does not predict quality. Ask for the same six photos from every seller and compare side by side.
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Checks before payment
- Full reference string and case size.
- Photo of the caseback engraving under light.
- Caliper photo of case thickness.
- Movement photo, balance wheel and rotor.
- Scale photo of the watch on the bracelet.
- Return terms in writing. US law bans import and sale of counterfeit goods, so a return is the only recourse.
Specs on the genuine watch come from Omega and METAS. Specs on a specific replica come from the seller. If the seller cannot supply a movement photo, treat the listing as unknown.
Replica Constellation 131.20 Synonym: The Search Terms Buyers Use