How to Spot a Fake Audemars Piguet Jules Audemars Moon Phase
A genuine Jules Audemars moon phase carries a photorealistic lunar disc, layered dial printing, and a hand-finished in-house caliber under a sapphire back. Most fakes fail in three places: the moon disc, the alignment of the moon and date apertures, and the polished bevels on the lugs. Start there. If two or more of those fail, stop and treat the watch as a fake.
What you need
- A 10x jeweler's loupe
- A phone with a macro or close-focus mode
- A bright, diffused light source
- A digital caliper or a ruler with millimeter marks
- The reference number and metal type for the exact model
The Checks
- Study the moon disc. A real disc shows a textured, matte moon surface set against a deep blue gradient sky, with stars cut or printed into the plate. Fakes print a flat cartoon moon that reads glossy and pale, and the stars sit uneven against the aperture edge.
- Loupe the brand text. Look at "Audemars Piguet" and the Jules Audemars script. Genuine lettering has thick-to-thin strokes with open counters and no bridging. Fakes show fuzzy grey outlines, even stroke weight, and letters that bleed into the lacquer.
- Compare the two apertures. The moon window and the date window should share one vertical axis and an identical bevel. A fake often drops one window lower than the other and leaves a sharp die-cut edge instead of a polished frame.
- Inspect the case and lugs. Genuine lugs hold crisp polished bevels with straight hand-drawn striping on the flanks. The line between brushed and polished surfaces is single and clean. Fakes show rounded bevels, wandering brush marks, and a blurred boundary.
- Measure the case. Match diameter, thickness, and lug width against the published spec for the reference, to within 0.1 mm. A gold reference should feel heavy for its size. Plated and steel copies read light in the hand.
- Work the crown and pusher. Advance the moon phase one step at a time. A real caliber moves the disc with a small, crisp click and no backlash. Fakes grind, skip, or jump two positions in one push.
- Read the movement through the back. Genuine pieces show Geneva stripes, polished screw heads, and a signed rotor with a gold oscillating weight on many gold references. Fakes show stamped plates, mismatched engraving fonts, and rotor text sitting on a flat, unfinished surface.
- Cross-check the reference number. Confirm the metal, dial variant, and case size match the number engraved on the caseback and stamped on the movement bridge.
- Review the paperwork. The certificate, box, and any service receipt should name the same reference and serial as the watch. A missing serial on any document is a warning sign.
Fast verdict
A moon phase display tracks a 29.5-day cycle, so it drifts out of sync during months that do not run 31 days and needs resetting. A seller who claims the watch "never needs setting" is guessing. Combine that with soft dial print, a flat moon, or a blurred bevel line, and the watch is a fake.