The short answer
A fake Audemars Piguet perpetual calendar is a replica of the Royal Oak Perpetual Calendar, and in practice that means ref. 26574 nine times out of ten. The better ones get the case right, the 41 mm width, the Grande Tapisserie dial, the tapering integrated bracelet. What almost all of them miss is the calendar logic. A real AP calibre 5134 knows February is short, knows leap years exist, and holds the correct date with no correction until 2100. Most replicas run a plain 31-day cycle and treat the month and leap year windows as decoration. So decide what you want first. A replica can sell you the look. Nobody sells you the mechanism at replica money.
Top Fake AP Perpetual Calendar Watch: Ultimate Guide
What the genuine watch does
The 26574 is 41 mm across and 9.5 mm thick in steel, which is the number that trips up most fakes. Inside sits calibre 5134, a hand-wound movement built on the 2120 base with a perpetual calendar module stacked on top, about 40 hours of reserve. The dial layout is the part you will stare at all day:
- Day of the week in a subdial at 9
- Date in a subdial at 3
- Month and leap year indicator at 12
- Moonphase at 6
- Week of the year on a scale printed around the outer edge, read by its own hand
Setting happens through recessed correctors, not by pulling the crown and spinning the date forward. That detail matters when you ask a seller for a video.
Three tiers of replica
The cheap tier is a Miyota or Seiko automatic with a day-date readout and a moonphase disc glued onto the dial. The month hand does not move, or it moves every 30 days. Thickness runs past 12 mm and the caseback is a slab.
audemars piguet perpetual calendar replica
The middle tier uses a thin automatic with a calendar module on top. The month snaps over on the 1st. The leap year window is a printed disc that never advances. February has to be corrected by hand every year.
The top tier is a custom module built by one of the specialist workshops. It behaves like a 30/31 movement with a manual February nudge, the week hand tracks, and the moonphase advances on a 29.5 day cycle. This is the one worth the money if you care about function at all.
What I check first
- Thickness. Genuine steel is 9.5 mm. Anything above 10.5 mm wears like a different watch and the caseback profile goes flat and thick.
- Dial depth. The Grande Tapisserie squares should have square cut walls and even shadow under light. Soft, shallow checks read as printed, not machined.
- Moonphase disc. Real ones use a photographic moon on a deep blue disc. Look for a pale grey circle with a smudged face and you are looking at the cheap tier.
- Subdial hands. Thin, pointed, correct length. Painted hands on a five figure watch look wrong from a foot away.
- Bracelet. Chamfered links, the taper toward the clasp, the logo engraving. On a Royal Oak the bracelet carries as much of the look as the bezel.
Questions to ask the seller
Ask for a video of the date flipping at midnight, the month changing on the 1st, and the moonphase going forward when the corrector is pressed. Ask for movement photos, not catalog renders. A seller who cannot produce a two minute clip is not a seller worth using. Anyone who answers with stock images only, or who claims a 31-day module is a true perpetual calendar, is either uninformed or hoping you are.
Price and how to buy
Expect the entry tier around the low hundreds, the middle tier in the several hundreds, and the small number of properly built perpetual calendar replicas well past that. Pay with a method that gives you recourse, confirm the return window in writing, and check the seller's photos against the reference you actually want. Steel with a blue dial and steel with a black dial are different listings, and nobody wants to argue about that after the box arrives.
One rule that is not negotiable
Never sell one as genuine, and never let it leave your hands described as real. That is fraud, not collecting, and it is the line that separates a hobby from a criminal charge.