Patek Philippe Nautilus 3700/001

The Patek Philippe Nautilus Reference 3700/001, affectionately known as the “Jumbo,” is widely considered the pioneer of the luxury sports watch genre alongside the AP Royal Oak. Designed by Gerald Genta and launched in 1976, it defied convention with its massive 42mm size, steel construction, and price tag comparable to a Patek Philippe gold dress watch.

The reference “3700/001” (often shortened to 3700/1) specifically denotes the first series of production. It is distinguished from the later 3700/11 by its wider, straighter bracelet and specific case manufacturing. This reference represents the purest form of Genta’s original vision: a rugged, 120-meter water-resistant monobloc case powered by one of the finest ultra-thin movements ever made.​​

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History & Production Period

• Production Years: 1976 – 1982 (approx.)
• Total Production: Estimated at ~3,300 to 3,500 examples in stainless steel (3700/1A).​
• Context: Launched during the Quartz Crisis, the 3700 was Patek’s bold assertion that high-end watchmaking had a future in steel. The advertising slogan famously read, “One of the world’s costliest watches is made of steel.”
• Evolution: In 1982, Patek Philippe transitioned production to the Reference 3700/11. The primary change was the manufacturing of the case and bracelet (moving from Favre-Perret to Ateliers Réunis) and a significantly narrower bracelet taper.​

Technical Specifications

• Case Architecture: Two-part “monobloc” construction. The case body and back are a single piece; the movement is loaded from the front, and the bezel is secured by four lateral screws through the “ears.” This design was patented to ensure water resistance of 120 meters—a remarkable feat for a non-dive watch in the 1970s.​​
• Dimensions:
  • Diameter: 42mm (10-4 o’clock axis)
  • Thickness: 7.6mm (ultra-thin profile)
• Material: Stainless steel (most common), with rare executions in Steel/Gold (3700/1AJ), Yellow Gold (3700/1J), White Gold (3700/1G), and Platinum (3700/1P).

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Movements/Calibers

The 3700/001 is powered by the Caliber 28-255 C, a legendary movement based on the Jaeger-LeCoultre 920 ébauche.

• Significance: This is the only movement used by all three “Holy Trinity” brands (Patek, AP, Vacheron) for their luxury sports watches. Patek’s version is often cited as the finest execution, featuring their patented Gyromax balance.​
• Key Specs:
  • Thickness: 3.05mm (ultra-thin)
  • Jewels: 36
  • Frequency: 19,800 vph (2.75 Hz)
  • Winding: Central rotor with ruby roller bearings (switch rails) rather than ball bearings, ensuring a thinner profile and smoother winding action.​
• Features: Date complication with “rapid” advancement (no quickset in the modern sense; adjusted by oscillating between 10 PM and 2 AM).​

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Dial Variations

The dial of the 3700/001 is a critical authentication point. The original dials were produced by Stern Frères and are hand-finished.

• Texture: Horizontal grooves (ribbed) with a gradient blue-black color (“Charcoal Blue”).
• “Sigma” Dial: Original dials must feature the “aprior” or Sigma mark (σ SWISS σ) at the 6 o’clock position. This indicates the baton hour markers and hands are made of solid white gold.​
• Aging: The blue lacquer on early examples is unstable and often degrades to a tropical brown, bronze, or “stardust” effect. While technically damage, attractive tropicalization can command high premiums.​
• Types: Collectors identify up to 7 distinct dial generations (“Type 1” through “Type 7”).
  • Type 1 (Early): Minute track has small lines (not dots). The accent on “GENÈVE” is very close to the E.
  • Type 2-3: Minute track uses dots. Font weight variations.
  • Service Dials: Later service dials often lack the accent on “Geneve” or have different “Swiss” placement. These significantly reduce collector value compared to an original Sigma dial.​

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Case & Bezel Variations

• Case Number: Stamped inside the back of the case (visible only when opened).
• “Ears”: The hinge-like ears on the 3700/1 are slightly straighter and more prominent compared to the curvier ears of the modern 5711.
• Polishing: The bezel should have a vertical satin finish on top and a high-polish bevel on the edges. The contrast between these finishes is vital; over-polished examples lose the sharp definition of the octagonal bezel corners.​​

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Bracelet & Strap Options

The bracelet is the primary identifier distinguishing a 3700/001 (Series 1) from a 3700/11 (Series 2).

• 3700/1 (Series 1): Known as the “Wide” or “Fat” bracelet.
  • Links are wider throughout the length.
  • Tapers from the case to approximately 16mm at the clasp.
  • The overall feel is heavier and more robust.​
• 3700/11 (Series 2): Known as the “Narrow” or “Thin” bracelet.
  • Tapers aggressively to 14mm at the clasp.
  • Links near the clasp are noticeably narrower, giving a more tapered, jewelry-like appearance.​

Clasp:

• Type: Simple, single-fold stainless steel deployant. It uses a friction-fit lock (no push-buttons) with a safety flip-lock stamped with the Calatrava Cross.
• Construction: The blades are stamped steel, often considered “flimsy” by modern standards but correct for the period. Early clasps are unmarked or have minimal text; later ones have clearer “Nautilus” and “Patek Philippe” engravings.​

Identifying Original vs. Replaced Parts

• Dial: Verify the presence of the Sigma (σ) symbols. A dial marked simply “SWISS” is likely a service replacement from the 1990s or later.​
• Date Wheel: The original date disc has a white background with black serif numerals. The font should be distinctively vintage; modern service discs have a different font weight.​
• Crown: Original crowns are unsigned (no Calatrava Cross) on very early examples, though many were replaced with signed crowns during service. A signed crown is acceptable but an unsigned one is a rare bonus.​
• Cork Box: The 3700 was originally delivered in a legendary cork box. These boxes are incredibly fragile and prone to crumbling. An intact original cork box is highly valuable ($5,000–$10,000+ alone).​​

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Collector Notes & Market Context

• Market Status: The 3700/1A is a “blue chip” investment watch. It generally commands a higher price than the later 3700/11 due to the preference for the wider bracelet and “original” status.​
• Condition: Unpolished cases are the holy grail. The complex geometry of the bezel and ears makes polishing obvious and detrimental to value.
• Documentation: An “Extract from the Archives” is essential to confirm the movement and case numbers match, as Patek Philippe does not reissue original Certificates of Origin.
• Wearability: Despite being a vintage watch, the 3700 is extremely wearable due to its slim 7.6mm profile. However, owners should be cautious with water resistance, as 40+ year old gaskets in a monobloc case can be risky even if serviced.