Short answer
"Fake Constellation 131.90" is a search phrase for a replica Omega Constellation listed at $131.90. The number is a price in US dollars, not an Omega reference. Omega reference numbers in the Constellation line begin with 131.10, 131.20, 131.25, or 131.53, depending on case size and metal.
Where the number comes from
Replica sellers price in whole dollars. $131.90 sits in the bottom tier of the replica market. Listing ranges seen in the trade: $40 to $150 for quartz copies, $200 to $400 for mid-tier automatics, $400 to $800 for high-grade copies. A $131.90 Constellation buys a case that copies the outline and little else.
What the genuine reference looks like
The steel 39 mm Constellation Master Chronometer is reference 131.10.39.20.01.001. Specs: Calibre 8800 or 8801, Co-Axial escapement, 55-hour power reserve, 15,000 gauss magnetic resistance, METAS Master Chronometer certification, sapphire crystal front and back, 50 m water resistance. The case carries claws at 3 and 9 o'clock. The bracelet uses half-moon links. The caseback holds a stamped Observatory medallion with eight stars. Retail runs from about $5,700 to $9,000 USD, based on size, metal, and stones.
What $131.90 buys
- Quartz movement. The seconds hand jumps. A Co-Axial movement sweeps.
- Mineral glass, not sapphire. It scratches.
- Gold plating measured in microns. It rubs off at the clasp and crown.
- Printed or etched caseback medallion. The genuine part is stamped metal.
- No METAS certificate, no serial matching the card, no Omega warranty.
- Case diameter off by 0.5 mm to 2 mm. Bracelet end links rattle.
Checks that settle the question
- Watch the seconds hand under a loupe. 28,800 vph beats eight times per second.
- Read the caseback medallion. On a genuine piece it sits centered, with sharp stars.
- Compare the date font at 6 o'clock against Omega's own photos.
- Weigh the watch. A steel 39 mm Constellation is about 130 g on the bracelet.
- Check the serial against Omega service records. Replicas fail this step.
Legal note
US Customs and Border Protection seizes counterfeit watches at import. Trafficking in counterfeit goods carries criminal penalties under 18 U.S.C. 2320, with up to 10 years for a first offense. Resale in the US is a federal offense. Buying for personal use risks seizure with no refund.
References and specs above come from published Omega and METAS data. Replica listings change often. No single check proves authenticity. A watchmaker with an Omega parts account can open the case and confirm the movement in minutes.