Top pick for a fake c131.23: a spec-first build from a seller who publishes the movement caliber, case diameter and thickness, lug width, weight in grams, and factory QC photos before payment. A reference code like c131.23 has value only if the listing behind it can be checked line by line against a genuine watch, and most listings cannot pass that test. The criteria used in this guide: documented movement, measured case specs, dial and bracelet details shown in macro, a written QC and return policy, and a seller who answers spec questions in writing rather than with emoji.

What a c131.23 code actually tells you

Treat c131.23 as a spec ticket, not a brand. Codes of this shape circulate in replica forums and chat groups to pin down one build: a case profile, a dial variant, a movement family, a bracelet style. Two sellers can both list the same code and ship different watches, because nothing enforces the label.

Your first job is to confirm what the code maps to on the genuine side. Case size, dial layout, bezel type, bracelet taper. If a seller cannot name the real watch the code points to, the code is decoration and the listing is a lottery. This is the single fastest filter you have, and it costs one message.

Option 1: The spec-first build (top pick)

This is the listing where the seller publishes a spec sheet before you ask, then answers follow-up questions with measurements and photos. You get a movement photo with the rotor and balance visible, calipers on the case, and a macro set of the dial, date window, and end links.

  • Pros: you can verify the movement family before payment; case thickness and lug width are stated, not guessed; QC photos arrive before shipping; replacement links and gaskets are usually available later; disputes are easier because the seller committed to specs in writing.
  • Cons: costs more than a blind batch; waiting lists are common on popular codes; you have to do the reading, and a seller who sends a spec sheet expects you to use it.

Best for: a first replica purchase, or anyone who has already been burned by a listing that looked right in a thumbnail.

Option 2: The low-cost batch

Group buys and discount batches sell the same code with less paperwork. The watch may be fine. The problem is that nothing is pinned down, so the movement can change between orders and the crystal spec is often unstated.

  • Pros: lowest entry cost; fast shipping from local stock; good for a beater or a second watch you do not plan to baby.
  • Cons: movement substitutions are common and rarely disclosed; sapphire versus mineral glass may be unclear; no macro photos; bracelet screws and spring bars tend to be the weak points; returns are effectively nonexistent.

Best for: buyers who already own a verified build and want a spare, and who accept the risk in exchange for the price.

Option 3: The "Swiss movement" premium

Some listings charge a premium for a Swiss movement inside the same case. It can be real. It can also be an Asian clone with a Swiss-sounding label, because Swiss Made rules from the Federation of the Swiss Watch Industry require a Swiss movement plus casing and final inspection in Switzerland, and no replica factory meets that standard.

  • Pros: a genuine Swiss automatic winds smoother and holds rate better; service parts exist; the premium is small compared with the total cost of a bad purchase.
  • Cons: hard to verify without a movement photo; the premium is often applied to an unchanged watch; resale value of any replica stays close to zero regardless of the movement.

Best for: collectors who will open the case back and confirm the caliber, and who treat the premium as a parts cost rather than an investment.

Verification checklist before payment

  1. Confirm the code maps to a real reference, with case size and dial layout named.
  2. Ask for a movement photo with the case back off, showing the rotor and balance wheel.
  3. Ask for case diameter, thickness, and lug width in millimeters, measured with calipers.
  4. Ask for total weight in grams, then compare it with the genuine figure.
  5. Ask which crystal is fitted, and whether it has anti-reflective coating on one side or two.
  6. Request macro shots of the date font, the rehaut engraving, and the end-link fit against the case.
  7. Ask about water resistance. Any claim should reference pressure testing, since ISO 22810 defines how watch water resistance is classified and tested.
  8. Get the QC and return terms in writing before you send money.

Red flags that end the conversation

  • No movement photo, or a stock photo lifted from another seller.
  • "Same factory as" with no spec sheet behind it.
  • Pressure to pay in a channel with no record and no dispute path.
  • A price far below every other listing for the same code.
  • Refusal to state case thickness, which is the spec most often fudged.

One legal note worth stating plainly: selling counterfeit branded goods infringes trademark rights and is illegal in the United States, and U.S. Customs and Border Protection seizes counterfeit watches and publishes seizure statistics each year. Buy and ship with that in mind.

Which option fits your case

Buy the spec-first build if this is your first fake c131.23 and you want a known quantity. Take the low-cost batch only as a second watch, with the expectation that you are gambling on the movement. Pay the Swiss premium only when the seller will show you the movement and you can identify the caliber yourself. In every case, the code is the starting point, not the proof.