The pick
Start with a caliper. The genuine Nautilus 5711/1A measures 40 mm across and 8.3 mm thick. Most counterfeits measure 9.5 mm to 10.5 mm. That gap shows at the cuff and in profile photos. A counterfeit that reads under 8.7 mm earns the pick. Every other check on this page sits on top of that number.
Top Quality Nautilus 5711/1A Replica: Comparison Review
The second number is beat rate. Patek used caliber 324 S C in the 5711/1A-010 until 2019, then caliber 26-330 S C. Both run at 21,600 vph with a 45 hour power reserve. Most counterfeits run a Miyota 9015 at 28,800 vph and 42 hours, or a Chinese copy of the ETA 2824 at 28,800 vph. A timegrapher reading of 28,800 on a watch sold as a 5711 is a mismatch, not a detail.
Option 1: thin case, clone movement
Case 8.4 mm to 8.7 mm. Movement decorated after the 26-330 S C: gold-toned rotor, Geneva stripes, perlage on the bridges. Date steps once at midnight. Dial gradient runs light at the center to dark at the edge, with horizontal embossed bars cut at even depth. Bracelet links brushed with polished flanks, screw heads flush. Listed price band: about $800 to $1,500. Buy this tier only when the caliper photo arrives with the listing.
how to tell if patek philippe nautilus 5711/1a is fake
Option 2: mid tier
Miyota 9015 inside, case 9.2 mm to 9.8 mm. Dial gradient close but flatter. The embossed bars lose depth near the date window. Date font heavier than the genuine disc. Clasp edges sharp. Listed price band: about $400 to $700. Reads at arm's length, fails under a loupe and fails on a timegrapher.
Option 3: entry tier
Chinese 2813-type movement, case 10 mm and up. Dial printed instead of embossed. Lume dim. Rotor audible. Date creeps over 40 minutes. Listed price band: about $150 to $350. Skip it if the goal is the 5711 silhouette.
Checks before payment
- Caliper photo on the case flank, not on the crystal.
- Timegrapher shot with rate, amplitude, and beat error visible.
- Dial macro: horizontal bars raised, not printed, and even from 9 to 3.
- Date window: steel frame, white disc, black numerals, font weight matched to the hour markers.
- Caseback: sapphire crystal, engraving depth even, reference and movement numbers legible.
- Bracelet screws: flush heads, no locking compound visible in the threads.
Context
Patek discontinued the 5711/1A-010 in January 2021. The olive green 5711/1A-014 followed, and the Tiffany Blue 5711/1A-018 closed the line in December 2021 at 170 pieces. Phillips sold one of those for $6.5 million. Retail at the end was about $34,893. Secondary prices ran far above that level, which is why counterfeits of this reference are common and why the 8.3 mm number carries more weight than a box and papers set.