"Fake Audemars Piguet perpetual calendar 3399" is a search string, not a real watch. Audemars Piguet Royal Oak Perpetual Calendar references use codes such as 25654, 25820, 26252, 26574 and 26606, so "3399" points to a price tag or a marketplace listing number attached to a counterfeit. No genuine perpetual calendar AP sells for four figures.

Is there such a thing as an Audemars Piguet reference 3399?

No. Audemars Piguet reference numbers for this line are alphanumeric codes, often followed by a material suffix such as BA for yellow gold, ST for steel or PT for platinum. A plain four-digit number like 3399 does not appear in the brand catalog.

When a listing shows "3399" beside a perpetual calendar, it is usually the asking price in dollars or a seller's internal stock code. Genuine examples from the 1980s through today trade from the tens of thousands into six figures.

Why do fake AP perpetual calendars look convincing online?

Product photos hide the parts that matter. Subdial hands, moonphase discs, bracelet links and caseback engraving cannot be judged from a compressed image shot at an angle.

Counterfeiters also copy the marketing. A seller reproduces the dial layout, the polished bevels and the box, then ships a watch with a decorative movement that has no calendar mechanism inside.

How do you spot a fake Audemars Piguet perpetual calendar?

Does the calendar actually work?

On a genuine perpetual calendar, the date, day, month, moonphase and leap year indicator all advance on their own and stay accurate through the year 2100. Pressing the case correctors moves each function with a firm, precise click.

A fake often has the extra registers printed but no gearing behind them. Owners report sticky dates, a moonphase that never moves, and correctors that do nothing at all.

What should the dial and subdials look like?

Authentic AP dials show sharp, dense printing, evenly spaced subdials and a moonphase disc rendered with fine detail. Counterfeit dials tend to carry thicker text, uneven register spacing and a flat, cartoonish moon.

Check the borders of the date and month windows. On a genuine watch those aperture edges are cut and finished cleanly, while replicas show burrs or an uneven frame.

Does the case finishing give it away?

Genuine Royal Oak cases alternate brushed surfaces with mirror-polished bevels, and the transition lines stay crisp. Replicas usually show rounded edges, inconsistent brushing direction and a soft crown.

Weight is another signal. Solid gold references sit heavy on the wrist, while a plated or steel fake feels light for its size.

What about the caseback and serial numbers?

Authentic casebacks carry clean, deep engraving with a serial and reference number that the brand can verify. Fakes often use shallow lasering and mismatched numbers between the caseback and the movement.

Ask a boutique or authorized service center to confirm the serial before any money changes hands. Audemars Piguet can tell you whether a reference and serial pairing was produced.

What do service records and papers tell you?

Complete sets with a matching warranty card, presentation box and service history are harder to fake than a watch alone. Call the service center listed on the paperwork and confirm the work order exists.

Treat "sold as is" listings, stock photos and sellers who refuse a physical inspection or third-party appraisal as red flags.

What are the risks of buying a counterfeit?

Counterfeit watches are illegal to import into the United States, and shipments can be seized and destroyed. Buyers lose both the money and the item, with no warranty, service support or resale value.

There is also no parts support. Authorized service centers will not work on counterfeit watches, and independent watchmakers often cannot source matching components.

Frequently asked questions

How can I tell if a perpetual calendar AP is genuine from photos?

You usually cannot. Ask for a video of the calendar advancing, a macro shot of the caseback engraving, and an independent serial check.

How much does a genuine AP Royal Oak Perpetual Calendar cost?

Pre-owned older references commonly start in the mid five figures, and modern steel or gold references climb from there. A four-figure price is a counterfeit signal.

Can a jeweler authenticate my watch?

Some can, but the safest route is an Audemars Piguet boutique or authorized service center, which has access to the reference archive.