Patek Philippe Authentication Guides

Patek Philippe sits at the top of the watch market, and counterfeiters focus their best work on the steel sports models — the Nautilus 5711 and the Aquanaut 5167 — because that is where the resale money is. A good fake Nautilus can get the case silhouette and the embossed dial texture close enough to fool a quick glance, so authentication has to go deeper than shape.

The checks that separate real from fake: the horizontal gradient and depth of the dial embossing, the sharpness of the applied white-gold hour markers and their luminous fill, the printing registration of the Patek signature and the small text at the bottom of the dial, the brushed-and-polished transitions on the case and bracelet, and — most decisive — the movement. Patek's caliber finishing (Geneva striping, chamfered bridges, blued screws, the Calatrava cross on the rotor) is executed to a standard replicas simply do not reach. The case-back serial and movement number must also match Patek's records for that reference.

All of the dial, case and caseback markers are readable from high-resolution photos, which is why our specialists can authenticate a Patek from images. The guides below cover the Nautilus, Aquanaut and Calatrava check by check.