A fake Audemars Piguet Perpetual Calendar is a replica of the Royal Oak Perpetual Calendar (most often refs 26574, 26579, or 25654) that copies the four-subdial layout of the genuine watch but rarely copies the true perpetual calendar mechanism. The fastest tells are a case thicker than 10mm, a leap year indicator that does nothing, and a moon phase disc that drifts out of sync within weeks. A genuine Royal Oak Perpetual Calendar 26574ST measures 41mm wide and 9.5mm thick, with the calibre 5134 keeping the calendar correct until 2100.

What is a fake Audemars Piguet Perpetual Calendar?

It is a counterfeit or replica wristwatch styled after the AP Royal Oak Perpetual Calendar line, which AP launched in 1983 and still sells today. The genuine watch carries a self-winding perpetual calendar movement plus the Gerald Genta octagonal bezel, tapisserie dial, and integrated bracelet. Replicas range from crude quartz pieces to high-end 1:1 builds that get the silhouette right and the calendar logic wrong.

How can you tell a fake AP Perpetual Calendar from the real one?

Compare the physical dimensions first, because almost every replica fails there. The genuine 26574 is 9.5mm thick, and the ceramic 26579CE sits close to that figure. Most replicas land between 11mm and 13mm and sit high on the wrist.

• Case thickness: over 10mm on a steel Royal Oak Perpetual Calendar is a red flag.
• Leap year subdial: on the real watch it shows 1, 2, 3, or 4 and advances once a year. On most replicas it is painted or stuck.
• Month hand: genuine hands have crisp, hollowed tips and snap cleanly between indexes.
• Caseback: the calibre 5134 has a 22k gold rotor with deep engraving and hand-finished bridges. Replica rotors look flat and printed.
• Bracelet: genuine links taper by fractions of a millimeter from case to clasp. Replicas taper in visible steps.

What are the dial tells on a replica Royal Oak Perpetual Calendar?

The Grande Tapisserie pattern is the hardest element to fake. Genuine squares are cut by a pantograph with sharp raised edges and consistent depth across the dial. Replica dials show shallow, rounded, or uneven squares that flatten under a loupe.

Check the moon phase disc too. AP's moon phase in the calibre 5134 needs correction roughly once every 122 years. Replica discs use a printed image and a 29.5-day gear that drifts from the actual lunar cycle within a few months.

Subdial spacing is another giveaway. The date, day, month, and moon phase registers should sit in a balanced cross. Replicas often crowd the date subdial toward the center because the base movement does not match the module.

Does a replica AP Perpetual Calendar really work as a perpetual calendar?

Almost never. Genuine perpetual calendars know that February has 29 days in leap years and need no manual correction until March 1, 2100. Replicas typically use a modified Miyota or Chinese automatic with a calendar module that behaves like an annual or complete calendar, so February 29 breaks the sequence and you reset it by hand.

Some mid-tier replicas include a functioning leap year wheel, but it is a decorative disc rather than a mechanically programmed cam. If the seller calls it a real perpetual calendar at a four-figure price, assume it is not.

What do fake AP Perpetual Calendars cost?

Entry replicas sell for $150 to $300 and use quartz or basic automatic movements. Mid-tier builds run $400 to $700 and add sapphire crystal and closer dial texture. Top-tier 1:1 replicas fetch $700 to $1,300 and copy case dimensions closely, though the movement and calendar function still fall short of the real thing. A genuine steel 26574 trades well above $100,000 on the secondary market, so any "new" AP perpetual calendar offered under $5,000 is counterfeit.

Frequently asked questions

Is a replica Audemars Piguet Perpetual Calendar worth buying?

It is worth it only as a costume piece if you accept that the calendar is decorative. Buyers who want a working perpetual calendar with correct leap year logic should look at entry-level genuine perpetuals from other brands instead.

Can a jeweler service a replica AP perpetual calendar?

Most independent watchmakers will decline, because parts for the copied module are not available and the movement is not documented. That means a broken replica calendar is often unrepairable.