What Is the Replica Constellation 131.20?
The replica Constellation 131.20 is a copy of Omega's modern Constellation series, the reference group that begins with 131.20 and covers 36mm and 39mm cases in stainless steel, two-tone, and gold-cap finishes with an integrated bracelet. The best versions sell as 1:1 replicas and target the case profile, dial finish, and clasp engraving of the genuine watch. Cheap versions carry the same name but change the case shape, the movement, and the crystal.
The reference number is the key. Case size, bezel shape, and bracelet fit all change inside the 131.20 group, so a copy built on the wrong case stands out next to the real thing.
Which 131.20 References Do Replica Factories Copy?
Three shapes dominate the market.
- 131.20.36: a 36mm case, the closest match to the classic Constellation feel and the most common replica on sale.
- 131.20.39: a 39mm case for larger wrists, made by fewer factories and often less accurate.
- Two-tone and gold-cap models: steel case with gold-color bezel claws, finished by plating or gold wrap.
The bezel claws are the signature detail. Genuine claws are polished, sit flat on the case, and meet the bezel edge with a clean line. Copies show rounded tips, uneven gaps, and a duller polish.
What Separates a 1:1 Replica From a Cheap Copy?
Six points decide the quality tier.
- Case profile: good copies keep the slim side profile and the correct bezel angle. Low-end cases run thick and blocky.
- Dial: a sunburst or lacquer finish, applied markers with correct bevels, and a date window placed where the reference puts it, at 3 or 6 o'clock depending on model.
- Crystal: sapphire with the right dome and a proper coating. Mineral glass looks flat and scratches.
- Movement: quartz on the budget tier, a Japanese automatic in the middle, a decorated clone of the Omega calibre at the top.
- Bracelet: single-link design with a correct taper, solid end links, and screws rather than push pins.
- Clasp: the Omega logo, the reference stamps, and a firm release button. Stamped, hollow clasps are a giveaway.
Weight is a rough test. Copies with hollow links or aluminum spacers feel light and rattle on the wrist.
Which Movement Should You Choose?
Movement choice drives price more than any other part.
- Quartz: runs on a battery with one tick per second. Cheap to own, but there is no sweep and the second hand jumps.
- Miyota 9015 or Seiko NH35: automatic, smooth sweep, serviced by any watch shop. This is the value pick.
- Clone calibre 8520: a decorated automatic built on an ETA 2892 base, running at 25,200 vibrations per hour with a co-axial look rotor. The real calibre 8520 uses the same rate, so the sweep matches.
Ask the seller for the movement name in writing. "Swiss movement" on its own tells you nothing.
How Do You Inspect the Dial and Case Before Buying?
Ask for photos of the actual unit, not catalog shots.
- Macro shot of the dial at 12 o'clock. Check marker alignment and the star logo.
- Caseback photo. The Observatory medallion and the eight stars should be crisp, not worn or mushy.
- Side profile with calipers or a ruler to confirm thickness.
- Clasp photo, inside and out, to judge engraving depth.
- Short video with the watch running to check the sweep and the date change.
A seller who refuses these requests is not selling a 1:1 replica.
Bracelet and Clasp: Small Details, Big Difference
The integrated bracelet is half the look of a Constellation. On a good copy, the links taper from the case to the clasp without a step, and the end links sit flush with the case sides. Bad end links leave a visible gap and pinch arm hair.
Clasp quality separates tiers. Look for a machined body, deep engraving, and a button that snaps shut. Budget clasps use folded steel with printed logos that fade in weeks.
What Does a Constellation 131.20 Replica Cost?
- Under $100: quartz, mineral crystal, plated finish, stamped clasp.
- $150 to $250: automatic movement, sapphire crystal, solid bracelet, correct dial layout.
- $300 to $450: best 1:1 tier, clone calibre, wrapped gold on two-tone models, sharp case finishing.
Ranges shift with seller and region, and a high price alone does not prove quality. Compare photos of the same model from three sellers before you pay.
How Do You Vet a Replica Seller?
- Watch for photos of the exact watch you will receive, not stock images.
- Ask about the movement, crystal, and case material in a message so you have a record.
- Check the return window and the payment method before ordering.
- Look for buyers who posted their own photos of the same batch.
Care and Maintenance Tips
A replica Constellation 131.20 does not carry the same seals as the genuine model. Treat water resistance as splash-only unless the listing states a tested rating and the seller shows a pressure test.
Wipe the case and bracelet with a soft cloth after wear. Keep the watch away from chlorine, perfume, and hot water, which strip plating and dry out gaskets. An automatic copy should get a service every few years if you wear it often.
FAQ
Is the replica Constellation 131.20 water resistant?
Most copies handle splashes and rain only. A few top-tier builds use proper gaskets and pass a 3 ATM test, but confirm that with the seller before you swim.
Does the replica use real sapphire crystal?
The best 1:1 versions do. Budget copies use mineral glass, which you can spot by the shallow, flat reflection and the scratches that appear within months.
How close is a 1:1 Constellation 131.20 to the genuine watch?
On the wrist, the top tier matches case size, dial layout, bracelet taper, and weight range. Small gaps remain in movement finish, caseback engraving depth, and the polish on the claw tips.
Can a jeweler tell it is a replica?
Yes, if the watch is opened. Caseback stamps, movement decoration, and gasket quality give it away. From across a table, a good copy looks like a Constellation.
Should I pick the 36mm or the 39mm version?
Pick the size of the genuine reference you want to match. A 36mm copy on a 7-inch wrist looks close to the classic line, while the 39mm sits larger and is made by fewer factories.