Buy the case and the movement first, then the dial. A replica Audemars Piguet Royal Oak Perpetual Calendar 26574 that lands near the genuine 41 mm case width and 9.5 mm thickness will pass at arm's length even if the moon phase disc is decorative. One that prints the dial well but measures 13 mm thick will not. So start with dimensions and finishing, confirm which calendar functions you actually want, and treat any listing that promises a fully working perpetual calendar in a slim case as a claim to verify rather than a feature to trust.

What to look for

Case and bracelet

The Royal Oak shape depends on the octagonal bezel, the visible screws, and the angle where the bracelet meets the case. On a good copy the bezel sits flush with the case band, the screws align to the flat of the case, and no gap or light shows between the first bracelet link and the case. The bracelet should taper toward the clasp and flex without rattling. Screws and pins are the first thing to fail on cheap Royal Oak builds, so ask how the links are secured and whether spare screws ship with the watch.

Dial and calendar display

The 26574 spreads its calendar readout across the dial: a date register, a month and leap year indicator, a moon phase, and a week of the year scale. Compare subdial positions, hand lengths, and print weight against the reference page for the exact version you are copying, since the scales sit close together and a small shift is easy to see. Check the tapisserie grid alignment under the bezel, the thickness of the applied logo, and the sharpness of the month names. Uneven lume on the hands and subdials pulled toward the center are the usual tells.

Movement

Most replicas use a Miyota 9015 automatic as the base, with a calendar module stacked on top and a decorated rotor. It is a durable 24-jewel movement, which matters more than decoration because a perpetual calendar build has plenty of parts that can jam. A few higher-tier builds copy the thin micro-rotor architecture of the original calibre family; these are slimmer and quieter, but parts and service support are harder to find.

Parameter bands worth checking

• Case width: 40.5 to 41.5 mm. Outside that range the bezel proportions look off on the wrist.
• Thickness: under 12 mm is wearable, under 10.5 mm reads correct in profile.
• Weight: roughly 150 g and up in steel on a full bracelet. Under 130 g usually means hollow links or a thin caseback.
• Subdials: hands should reach the scale they point at without overshooting, and spacing should match the reference.
• Correctors: the side pushers must advance the calendar displays and reset without sticking.

Common pitfalls

• Grade labels such as AAA or 1:1 have no agreed definition. They are seller shorthand, not a standard.
• Listings that reuse brand press images or photos of a genuine watch. Ask for dated, in-hand photos with a handwritten note.
• Claims of a fully functional perpetual calendar in a thin case. Ask for a video showing the February 28 to March 1 transition.
• No demonstration of the correctors working on the case side.
• Water resistance claims with no gasket or caseback photos.
• Sellers who offer papers and packaging meant to make the watch look genuine. Selling a replica as a real Audemars Piguet is fraud, and that risk lands on the buyer as well as the seller.

FAQ

Does the perpetual calendar actually work?

A true perpetual calendar tracks month lengths and leap years on its own. Most replicas use day, date, and month modules that advance through the crown or pushers but do not self-correct for February or leap years. Some builds add a leap year wheel. If that function matters, demand a clip of the calendar being set through a February transition before you pay.

How do I judge a dial from photos alone?

Ask for a straight-on macro shot in daylight instead of a filtered wrist shot. Look at subdial spacing against the center hands, logo thickness, tapisserie alignment, and print quality on the month names. Blurry text and misaligned subdials are the two fastest disqualifiers.

Is buying one legal where I live?

Rules vary. Buying a replica for personal wear can be a customs and trademark issue, and importing counterfeit goods may lead to seizure. Reselling one as genuine is a criminal matter in many countries. Keep that line clear with any seller you deal with.