Short answer: A counterfeit Audemars Piguet Jules Audemars fails the same three checks almost every time. The case back engraving is shallow and sits in the wrong typeface. The dial printing turns fuzzy at the edges under magnification. The movement shows coarse machine striping with no polished bevels. Compare every detail against the exact reference number, because the Jules Audemars line spans thin dress models, chronographs, and complication pieces with different specifications.
Prerequisites
- A 10x jeweler's loupe
- Digital calipers and a gram scale
- Bright, diffused light and a clean surface
- Factory photos and published dimensions for the exact reference
- All papers, box, and service records that came with the watch
Case and case back checks
- Measure the case diameter and thickness with calipers, then compare the numbers with the published specs for that reference. A dress model that runs 1 mm thicker than spec is a warning sign.
- Weigh the watch on a gram scale. A solid gold case carries real mass for its size, while gold-plated steel feels light in the hand.
- Study the case back engraving with the loupe. Genuine stamps cut deep and even, with sharp letter serifs and clean spacing between the reference number and the serial number.
- Find the Swiss precious metal hallmark on the case. Counterfeits often omit it or stamp it in the wrong position with a soft, blurry outline.
- Compare the crown with reference photos. Many Jules Audemars models use a signed crown or a specific profile, and aftermarket crowns usually sit proud of the case or turn with grit.
- Check the crystal for edge distortion and the correct anti-reflective tint. Cheap sapphire or mineral glass shows a blue or purple cast and scratches at the edges.
- Inspect the lugs and spring bars. Genuine lugs are drilled and finished on the inside faces, while fakes leave raw tool marks.
Dial, hands, and date
- Magnify the printed signature. Genuine text has consistent stroke width, and the AP monogram sits square to the dial center.
- Check the hour markers. Applied gold markers are faceted and polished on every edge, with no glue squeeze-out around the feet.
- Inspect the hands. Faceted dauphine or leaf hands carry polished bevels, correct length, and no file marks on the flanks.
- Read the date window and its frame. The aperture should be beveled and the date font should match the reference, not a generic wheel.
- Watch the seconds hand for one second per tick. A jumping quartz hand means the watch is not a Jules Audemars caliber at all.
- Check the position and size of the Swiss Made stamp under the minute track.
Movement inspection
- Open the case back only with the owner's permission, or ask for a clear macro photo of the movement.
- Confirm the caliber matches the reference. Jules Audemars models use mechanical calibers such as the extra-thin 2120 family and the automatic 3120, not a stock ETA clone.
- Look at the rotor. The 3120 uses a solid gold rotor with engraved branding, and the lettering is crisp and centered.
- Check the finishing. Genuine AP movements show Geneva stripes, circular graining, polished bevels on every bridge edge, and black-polished screw heads.
- Read the caliber engraving. Spelling errors, laser-etched text, and flat screw heads point to a fake.
Papers, price, and provenance
- Match the case serial and movement number with the paperwork, then request an Extract from the Archives from Audemars Piguet to confirm the reference and production year.
- Compare the asking price with current market values. A Jules Audemars offered at a fraction of market price is not a bargain.
- Ask for the service history and the name of the watchmaker who serviced it.
- Walk away if the seller refuses movement photos, blocks an inspection, or ships from a listing that never shows the case back.
Common red flags
- Blurred or low-resolution photos of the case back
- Engraving that fades toward the edges of the letters
- A case back marked stainless steel on a watch sold as gold
- A serial number that does not match the archives record
- Hands, markers, or a date font that do not match the reference
- A box or warranty card printed with the wrong logo proportions
If a watch fails any single check, stop and get a second opinion from an authorized Audemars Piguet service center before money changes hands.