Top pick for a replica Audemars Piguet perpetual calendar listed under the 3399 tag is the 41mm Royal Oak style build with an automatic movement, a moonphase that tracks the lunar cycle, and subdials placed where Audemars Piguet places them. The criteria that decide whether any 3399 listing deserves your money are movement architecture, dial print and subdial geometry, case and bracelet finishing, and case back detail. Everything below walks through those points and ends with a use case for each type of buyer.

What the 3399 Code Tells You

3399 is a catalog tag used by replica sellers, not an Audemars Piguet reference. Audemars Piguet numbers its own perpetual calendar pieces in a different series, and official product pages are the only reliable source for case size, thickness, and caliber data. Because sellers recycle numeric tags, two dealers advertising the same 3399 can ship watches from different factories with different movements. Ask three questions before paying: which genuine reference is being copied, what is the case diameter, and what movement sits inside.

• Pro: a short code makes comparison between sellers quick.
• Pro: repeat buyers can reorder the same build without re-explaining specs.
• Con: the code does not lock in a factory or a movement.
• Con: batches change, so a good 3399 last year may not match this year.

Use case: a 3399 code works for a buyer who already trusts the seller and has seen live photos. For a first purchase, treat the code as a starting point and confirm the specs in writing.

Movement Is the First Thing to Verify

Three movement tiers show up in replica perpetual calendar listings. The cheapest is quartz with subdials that jump or do nothing. The middle tier is an automatic base with a calendar module stacked on top, which drives day, date, month, and a moonphase or a 24 hour disc. The top tier is a decorated automatic with an engraved rotor and bridges shaped to echo an Audemars Piguet caliber. None of these is a true perpetual calendar. A real perpetual calendar needs no date correction until 2100. Expect a complete calendar you adjust at the end of short months, and ask the seller to confirm that plainly.

• Pro: module automatics keep the calendar functions working and can be serviced by a competent watchmaker.
• Pro: decorated automatics look right through an open case back.
• Con: module movements usually add thickness, so the case sits taller than the genuine profile.
• Con: quartz versions are easy to spot once the second hand ticks.

Use case: pick the automatic with a working module if you plan to wear the watch. Skip quartz unless the watch is a costume piece for a single event.

Dial, Subdials, and Moonphase

The dial carries the most visual weight. On a Royal Oak style perpetual calendar, the subdials sit at fixed positions, the month and leap year readouts sit where the genuine places them, and the moonphase aperture shows a disc with stars on a dark field. Replica dials fail in predictable ways: the tapisserie grid looks flat rather than raised, the printed logo sits too high or too low, the date font is too bold, and the moonphase disc is a flat blue circle that never moves. Photograph the dial at an angle before buying and check that the subdial hands point to the same values as the reference photos you are copying.

• Pro: a good dial makes the watch read correctly from arm's length.
• Pro: moonphase discs are easy to check with a short video.
• Con: flat tapisserie and fat fonts are the most common tells.
• Con: misaligned subdial hands cannot be fixed without a service.

Use case: if you share photos or wear the watch in meetings, spend the budget on the dial and leave the case back for later.

Case, Bezel, and Bracelet

The Royal Oak case is an octagonal bezel with eight hexagonal screws, a thin bezel ring, and a tapered integrated bracelet. Check the bevels where brushed surfaces meet polished ones, the fit of the end links against the case, and the flex of the bracelet. Screws should sit flush and their slots should not be stripped. Cheap builds show rounded edges, gaps at the lugs, and a clasp that rattles. Weight is a rough guide too: a plated gold replica carries a steel core, so it sits lighter than a solid gold genuine piece of the same size.

• Pro: case and bracelet finishing is the easiest thing to judge from photos.
• Pro: a well finished bracelet makes the watch comfortable for daily wear.
• Con: sharp edges and loose end links are hard to correct after purchase.
• Con: plating wears at the clasp and lugs with regular use.

Use case: for daily wear, prioritize bracelet fit and clasp quality over every other detail.

Case Back, Engraving, and Movement Photos

An open case back invites close inspection. Look at the rotor engraving, the bridge shapes, the jewel count stamped on the movement, and the reference text around the case back rim. Genuine Audemars Piguet engraving is crisp and shallow, with even spacing. Replicas often show deep, blurred lettering and a rotor that is decorated on one side only. Ask for a video with the watch running and the case back in frame, then compare the text against images on the manufacturer's own product pages.

• Pro: a clean case back shows the seller stands behind the build.
• Pro: movement photos reveal the tier faster than any description.
• Con: some sellers use stock movement photos.
• Con: engraved text is easy to fake in a still image.

Use case: buyers who handle the watch often, or who plan to show it, should ask for video proof before paying.

How to Vet a 3399 Listing

Walk away from a listing with no live photos, only catalog renders. Treat decorative subdials, a price far below the rest of the market for the same movement tier, a refusal to confirm case diameter or movement base, and no stated return policy as warning signs. A seller who answers all four clearly is a seller worth dealing with.

• Pro: live video and written specs remove most of the guesswork.
• Pro: a stated return window gives you leverage.
• Con: demanding media slows the deal and some sellers walk.
• Con: seller photos can be taken of a different unit than the one shipped.

Use case: ask for the same three photos from every seller you consider, then compare them side by side.

Use Case Recommendations

First time buyer

Stay with an automatic module build in steel, confirm live photos, and keep the dial simple. Skip gold plating until you know how the bracelet fits your wrist.

Repeat buyer upgrading

Put the budget into a decorated automatic, a correct moonphase disc, and sharper case finishing. This is where the 3399 tag tends to pay off.

Buyer who wants the closest visual match

Focus on dial geometry and bezel screws. Those two details carry most of the recognition at normal viewing distance.

Bottom Line

A replica Audemars Piguet perpetual calendar tagged 3399 is a complete calendar with cosmetic upgrades, not a perpetual calendar movement. Judge it on the four criteria above, insist on live media, and match the build to how you plan to wear it. That approach keeps the purchase predictable.