A fake Omega Constellation 131 is a replica of Omega's current 39 mm Constellation generation, and most examples fail five simple checks: the polished claws at 3 and 9 o'clock, the applied logo and eight dial stars, the Co-Axial Master Chronometer movement, the caseback medallion engraving, and the weight and taper of the bracelet. Genuine 131 references are steel Master Chronometer watches tested by METAS, so a watch that misses any of those points is not the real thing.

What is the Omega Constellation 131 reference family?

The 131 prefix covers the modern stainless steel Constellation line, including the 39 mm and 41 mm models with integrated claws and a mono-bloc bezel. A full reference such as 131.10.39.20.01.001 breaks down into family, material, case diameter, movement group, and dial variant.

These watches use the Co-Axial Master Chronometer Calibre 8800 or 8900, run at 25,200 vibrations per hour, and hold a 55 hour power reserve with 150 m of water resistance. Every example leaves the factory with a Master Chronometer card that records its eight day test result.

How do you tell a fake Omega Constellation 131 from a genuine one?

Work through the watch from the outside in, because replica makers copy the silhouette well and the small details badly.

Case and claws

Genuine claws are milled as part of the case, sit flush with the bezel, and show crisp polished facets with sharp transitions to the brushed surfaces. Replica claws are often glued on or poorly fitted, leaving a visible seam or uneven gap against the case band. Check the crown as well: the Omega symbol should be deep, centered, and sharp, not shallow or rotated.

Dial and hands

The OMEGA name, the applied star, and the eight stars around the dial are raised metal on the original, with faceted edges that catch light. Fakes usually print them flat or use thinner appliques that sit lower than the genuine parts. On date models, the aperture should be sharp and centered with no white ring, and the seconds hand should reach the minute track exactly.

Bracelet and clasp

Genuine bracelets have tight end-link tolerances, no rattle, and a butterfly clasp with crisp engraving and a smooth push-button release. Replicas typically show loose links, a lighter feel, and a clasp with shallow stamps. Weigh the watch: a steel 39 mm Constellation on a full bracelet sits well above 130 g, while most copies come in noticeably lighter.

Caseback and movement

The sapphire caseback should reveal a finished rotor, Geneva stripes, blued screws, and the Observatory medallion on the inner caseback ring. Fakes often use a decorated third-party automatic movement with a wrong beat rate and a rotor that spins loudly. If the seller cannot show a Master Chronometer card matching the serial number, treat the watch as a replica.

What gives a first-copy Omega Constellation 131 away?

First copy watches sit at the top of the replica market, so the case shape, dial color, and bracelet profile often look right at arm's length. The tells appear under a loupe: soft claw edges, a slightly thick bezel, and Roman numerals with the wrong stroke weight. The movement is the hardest part to fake, so request a photo of the display back and a timing reading before you commit.

Frequently asked questions

Does a fake Constellation 131 have a real Master Chronometer movement?

No. METAS certification is issued per movement after eight days of testing, and no replica factory produces a certified Co-Axial calibre. A copy may run accurately and still fail the magnetic resistance and precision standards the genuine watch must meet.

Is a replica Constellation 131 water resistant?

Most copies hold 30 m or less in practice and often leak at the crown or caseback gasket. Never swim with a replica, even when the listing claims 150 m.

How much should a first copy Constellation 131 cost?

Realistic prices for a high-grade first copy land in the low hundreds of dollars, not the four or five figure range of the original. Anyone asking near retail for a replica is misrepresenting the product.

What to check before you buy

• Serial number repeated correctly on the caseback and the movement.
• Pictograms card and Master Chronometer card present and matching.
• Claw seams, logo depth, and dial print under a 10x loupe.
• Weight above 130 g for a steel 39 mm on a full bracelet.
• Seller photos of the display back instead of stock images.

If a single check fails, walk away. A genuine 131 is a precision instrument with paperwork, and an honest replica seller prices it as a lookalike.