A fake Constellation 131.20 is a replica Omega Constellation that a seller tags with the 131.20 case block from the current generation. The top pick for most buyers is a reference-matched 39 mm clone: integrated steel bracelet with brushed outer links and polished center links, a dial layout copied from the genuine catalog photo, and a clone co-axial automatic with a date at 6. Three things decide whether it deserves your money. First, whether the listed reference decodes to a real Omega configuration. Second, whether the case and bracelet proportions match that reference. Third, whether the seller shows photos of the actual watch instead of factory renders.

What the 131.20 block tells you

Omega builds its references from segments, and the current Constellation family opens with a case code such as 131.10, 131.20, or 131.23, which separates the metal mixes. The digits after that block carry the case size, the movement family, and the dial code. A seller who writes only "Constellation 131.20" is hiding the part of the reference that matters, because the same block covers more than one size and more than one dial.

  • Ask for the full eleven-digit reference and check it against the Omega product page before you compare anything else.
  • Compare the bracelet taper, the claw lugs, and the half-moon date window against a catalog photo at the same angle.
  • Treat any listing that reuses stock images from another seller as a pass.

Top pick: reference-matched 39 mm clone

This is the tier where the case profile, bezel engraving, and dial printing line up with the genuine watch at arm's length. It costs more than the generic tier, and the maker usually publishes movement photos and caseback engravings as proof of the build.

Pros

  • Case dimensions and lug shape match the reference, so straps and bracelets fit.
  • Clone co-axial automatic keeps the caseback thickness close to the original.
  • Engraved caseback and correct reference stamping make the watch readable to a trained eye.

Cons

  • Higher price than the dress-watch tier, often several times higher.
  • Waiting lists and batch delays are normal.
  • Service and parts support come from the seller, not a watchmaker network.

Second option: generic Constellation-style dress replica

These listings borrow the name and the general look, then use a plain three-hand quartz or low-grade automatic in a case that ignores the real proportions. The bezel engraving is shallow, the dial print is thick, and the bracelet end links rarely sit flush.

Pros

  • Low entry cost for a dress watch you can wear without worry.
  • Simple movements are cheap to replace if one stops.
  • Useful as a test purchase before committing to a higher tier.

Cons

  • Case and bracelet proportions do not match the 131.20 reference.
  • Dial printing and bezel detail fall apart under close inspection.
  • Resale value is close to zero, and returns are hard to enforce.

Third option: the genuine steel Constellation

If the goal is the look of the watch and not the price of the watch, a pre-owned steel Constellation solves the problem that fakes never fix: service, water resistance, and value retention.

Pros

  • Real co-axial movement with documented service history.
  • Holds value, so the total cost of ownership can beat a high-tier clone.
  • No import risk and no customs exposure.

Cons

  • Upfront price is far above any replica tier.
  • Pre-owned examples need a movement check and a bracelet stretch inspection.
  • Availability of a specific reference and dial can take months.

Legal and shipping reality

Counterfeit watches are illegal to import into the United States, and customs officers can seize a shipment without compensating the buyer. Sellers deal with this by splitting orders, relabeling parcels, and offering a reship policy, which tells you what the risk is. Pay with a method that leaves a record, and read the seller's policy on seizures before you order. Nothing in a seller's guarantee changes the fact that the goods are counterfeit.

Which option fits your case

Buy the reference-matched clone if you want the 131.20 look on a wrist and you accept the legal and after-sales risk. Buy the generic dress replica if you want a gold-tone dress watch for occasional wear and you do not care about reference accuracy. Buy the genuine steel Constellation if you plan to keep the watch past five years, want it serviced, or need it to hold value. In every case, ask for the full reference number and photos of the actual watch before money moves.