Patek Philippe Perpetual Calendar Ref. 3940J Second Series – 18K Yellow Gold

Patek Philippe Perpetual Calendar Ref. 3940J – Second Series (1988–1989)

The Patek Philippe Ref. 3940 stands among the most iconic perpetual calendars of the modern era — a model that redefined classical watchmaking in the 1980s. Introduced in 1985, it combined slim, refined proportions with a groundbreaking micro-rotor automatic movement, the Calibre 240Q.

This Second Series (circa 1988–1989) represents the perfect balance between early artisanal production and later refinement. Subtle dial updates define this evolution: the accent in “GENEVE” was dropped, the signature became bolder, and the sub-dials adopted softer bevels. These nuances give the 3940 Second Series its distinctive charm — sophisticated, clean, and unmistakably Patek.

The 36mm yellow gold case maintains perfect proportions for a dress watch — slim, discreet, and effortlessly elegant. Beneath the silvered opaline dial, the 240Q calibre orchestrates a full perpetual calendar with day, date, month, moon phase, and leap-year indication — a technical triumph achieved through minimalist design.

Collectors prize the 3940 Second Series as the most balanced expression of the model: more wearable than the first, more soulful than the later series, and eternally relevant to the collector who values quiet perfection over ostentation.

Specifications

• Brand: Patek Philippe

• Model: Perpetual Calendar

• Reference: 3940J (Second Series)

• Movement: Calibre 240Q, automatic micro-rotor

• Functions: Hours, minutes, perpetual calendar (day, date, month, moonphase, leap year)

• Case Material: 18K Yellow Gold

• Case Diameter: 36 mm

• Thickness: ~8.8 mm

• Dial: Silvered opaline with applied baton markers

• Strap: Brown alligator leather with gold pin buckle

• Year: Circa 1988–1989

• Water Resistance: 30 m

• Condition: Close to new old stock; unpolished, excellent preservation

• Set: Full set – original box and papers

Why This Watch Matters

• A defining model in Patek Philippe’s modern history

• Ultra-thin Calibre 240Q perpetual calendar movement

• Iconic second-series dial with refined Geneva design

• Collectible balance of vintage charm and modern precision

• Full set and pristine condition sold in 1988 at Gobbi in Milano

• Watch has not been serviced since it has never been worn

As with all WRIST ICONS watches, this piece comes with a 12-month warranty and full authentication. Viewing by appointment is available.