Only Online Auction

Hong Kong, Mar 03, 2021

LOT 199

Patek Philippe
Ref. 3945-1 G, self-winding, leap-year perpetual calendar, moon phases, AM-PM indication, silver “Sigma” dial; “Second series”; 18K white gold

HKD 330,000 - 424,000

CHF 38,000 - 48,800 / EUR 35,000 - 45,000 / USD 42,200 - 55,000

18K white gold, self-winding, round-shaped, gentleman’s wristwatch, with seven horological complications:
· Perpetual calendar
· Date of the month (subsidiary dial at 6 o’clock)
· Day of the week (subsidiary dial at 9 o’clock; indications given in English)
· Month of the year (subsidiary dial at 3 o’clock; indications given in English)
· Phases of the moon (aperture at 6 o’clock)
· Four-year cycle of leap-years (subsidiary dial at 3 o’clock)
· Diurnal (day-time) and nocturnal (night-time) hours with a 24-hour (AM-PM) scale (subsidiary dial at 9 o’clock)

Polished two-piece case, water-resistant with snap-on case-back.

Silver opaline colour “Sigma” dial with radial applied white gold indexes.

Movement 240 Q aut, adjusted to heat, cold, isochronism and 5 positions, “Poinçon de Genève” (Geneva Quality Hallmark or Geneva seal).

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Grading System
Grade: AAA


Case: 3


Movement: 2 *
Dial: 2-01

Very good

HANDS Original

Brand Patek Philippe, Geneva

Model “Perpetual Calendar”

Year circa 1991

Movement No. 3945-1 G

Case No.  2 875 132

Material 18K white gold

Bracelet integrated 18K white gold Patek Philippe bracelet with clasp

Diameter 36.1 mm.

Dimensions Length 175 mm. (approx.)

Signature dial, case and movement

Accessories Extract from the Archives


The Extract from the Archives, dated August 17, 2007, mentioned that this watch was sold on May 29, 1991.


Patek Philippe, Reference 3945 / 1

This reference is launched in 1985 and remained in production until circa 1998.

The watch is fitted with the Cal. 240 Q aut., with micro-rotor.

The majority were made in yellow gold, a few in white gold and a very small number in pink gold.

Regarding its horological complications, this reference is identical to Ref. 3940. Regarding its case, this reference is built without lugs and an integrated bracelet without lugs (noted that circa 1987, Patek Philippe produced a limited number of Ref. 3940 with a gold bracelet fitted between lugs).

The model was made in two series:
· First, with a “sunken” leap-year dial.
· Second, with fine lines crossing the leap-year dial.


“Sigma” dials

In the 1970s, the presence of the two Greek letters “Sigma” on either side of “SWISS” was intended to give a distinctive sign to Swiss-made dials with solid gold hour-indexes. Only members of APRIOR (Association pour la Promotion Industrielle de l’Or) were entitled to use this mark; among them, Patek Philippe, Rolex, Vacheron Constantin, IWC and Omega.