Short answer: most fake Vacheron Constantin complications do nothing. The subdials are printed or driven off the main gear train, the pushers are cosmetic, and the "tourbillon" is usually a decorated disc spinning on a jewel. Working VC complications do show up in the replica market, but they sit at the top tier, cost four figures and up, and are normally a movement from another brand dressed in a VC case and dial.

What a real VC complication is

Vacheron Constantin has been in Geneva since 1755, and its complications are the reason the name carries weight. Perpetual calendars (Patrimony, Traditionnelle), minute repeaters, tourbillons, chronographs (Overseas), world time, moon phase, equation of time. The maison's Les Cabinotiers department built the Reference 57260, a pocket watch with 57 complications presented in 2015 and described by the company as the most complicated watch ever made. That matters for buyers because it tells you what the fakers are aiming at, and how far short of it they land.

Three tiers of fake VC complications

Tier one is pure decoration. The subdial hands are friction-fit and never move, or they twitch with the seconds. Date windows show a fixed number. Pushers feel like loose buttons because there is nothing behind them.

Tier two is the partial function. The moon phase advances, the date flips at midnight, the chronograph counts. What breaks: no leap year correction, so the calendar goes wrong after February, month wheels that jump a day late in some months, and running seconds that stutter because the added module drags on the base movement.

Tier three is the honest clone. A modified or cloned movement where the complication is genuinely driven. Expect real money, real service headaches, and a watch that still is not a Vacheron.

Where reps give themselves away

  • Thickness. A VC perpetual calendar case runs around 8 to 11 mm. Most reps run 12 to 14 mm because the module sits on top of the base movement.
  • Subdial placement. Spacing and hand lengths get copied from photos, not a real dial, so the registers sit a millimeter off.
  • Pusher feel. Genuine VC pushers have short, clean travel. Reps feel spongy or grind.
  • Moon phase disc. Real discs run a 29.5-day cycle and are hand-finished. Cheap ones rotate once a day or never.
  • Caseback. Check engraving depth and movement finish. A stamped rotor on a basic Japanese movement is easy to spot.

Checks you can run at a table

Ask for the February 28 to March 1 transition on video. If there is a leap year indicator, ask to see it move. Put the chronograph through start, stop, reset three times. Time the tourbillon: a true one-minute tourbillon completes a rotation in 60 seconds, and you can watch a marker on the cage. For a claimed minute repeater, ask for an audio recording and listen for the sequence (hours, quarters, minutes) with distinct tones. I have not seen a functional minute repeater replica of a VC on the market.

Price sanity checks

Working perpetual calendar rep: several hundred to low four figures. Tourbillon rep: same range, sometimes more. Minute repeater rep: no. If a listing says repeater or grande complication at a few hundred dollars, the extra hardware is not there. VC is also a smaller replica category than Rolex or AP, so much of what sells as a "VC complication" is another brand's watch with a VC dial and case.

Legal and practical side

Selling a counterfeit as genuine is a crime in the US under 18 U.S.C. 2320, and customs seizes counterfeit watches on entry. Buying one for yourself is a different question than passing it off, but the resale and trade-in market is where people get burned. If you ever plan to sell, trade, or insure the watch, a fake VC complication is the wrong object to own.

Questions to ask a seller

  • Which base movement is inside, and who modified it?
  • What does the complication do, step by step?
  • Can you send video of the date changing, not just photos?
  • What is the case thickness in millimeters?
  • Is the tourbillon a real rotating cage or a decorative disc?
  • If the module fails, who services it?

If a seller cannot answer those, the watch is decoration. That is fine as costume, but price it that way.