The 3700/1A is the original Patek Philippe Nautilus — designed by Gérald Genta, launched in 1976, produced through 1990, and the watch that established the integrated-bracelet-sport-watch category that dominates modern collecting half a century later. 42mm (large for 1976), steel, with the famously thin two-piece case construction (the case was supplied by Favre & Perret, the same Geneva case maker who built the Royal Oak's case — Calatrava is a Patek model name, not the case maker, despite the common myth). The 3700's reputation is built on near-religious enthusiast devotion to its proportions and finishing.

What it is

Gérald Genta designed the Nautilus in 1974 for Patek Philippe; production began 1976. The 3700/1A is the first-generation reference, with the caliber 28-255 C (a Jaeger-LeCoultre 920 base — same family as the Royal Oak 5402's movement). Production through ~1990, replaced by the 3710 and then the 5711 family.

Variants include 3700/11 (white or champagne dial) and 3700/100 (deeper blue). The 1976 retail was 3,100 CHF — high for a steel sport watch and the rationale behind the famous 'most expensive steel watch in the world' positioning.

Buying notes

Common things to check: dial originality (Patek dials are heavily reluminescent service-replaced — verify the 'Patek Philippe Genève' wordmark printing under loupe; check the indices for crisp gold-applied work); bracelet originality (the H-link integrated bracelet is the Nautilus signature — verify the lug-end and clasp generation match the 3700 era); case finishing (the alternating polish/brush is hand-applied — over-restored examples lose definition); the 'Tiffany & Co' co-signed dials are a meaningful premium and the most-counterfeited variant; papers (a 3700 without Patek extract from the archives in this price bracket is essentially unsellable at market).

Market read

The 3700 has been a touchstone of the modern vintage market — it rose dramatically through 2017-2021, corrected through 2024, and remains one of the most-watched references in collecting. Original-strap, original-bracelet, full-paperwork examples trade at meaningful premiums. The market has stabilized at levels that still reflect the strong post-2017 thesis but no longer at the 2022 peak.

Service expectations

Patek service is Patek-direct only for the 3700 generation; expect 6-12 month turnaround and a five-figure service bill. The caliber 28-255 C is a robust automatic but the integrated case design means servicing the case + bracelet + crown gaskets all happens as one job. A Patek service record is a meaningful value lift.