Geneva, Nov 09, 2025

LOT 489

PATEK PHILIPPE, SWITZERLAND, ''DECK CHRONOMETER'', FIRST CLASS GENEVA OBSERVATORY, EXTRA QUALITY MOVEMENT, SILVER

CHF 15,000 - 25,000

HKD 146,000 - 244,000 / USD 18,800 - 31,300 / EUR 16,200 - 26,900 / JPY 2,850,000 - 4,750,000

Sold: CHF 20,000

A very fine, rare and large, silver, manual wind open-face, keyless deck chronometer with 36-hour power reserve indication at 12 o'clock, ''Extra'' quality movement, Guillaume balance. Matte silver dial with painted Roman numerals, outer minute track, subsidiary seconds dial, blued steel "spade" hands.


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Grading System
Grade: AAA

Excellent
Case: 2-6

Very good

Slightly oxidized
Movement: 3

Good
Dial: 2-01

Very good

HANDS Original

Brand Patek Philippe, Switzerland

Model ''Deck Chronometer''

Year Made in 1921 and sold in July 1938

Movement No. 178455

Case No. 600734

Diameter 62 mm.

Caliber 47 mm., 20 jewels, ''extra'' quality, straight line calibrated lever escapement, anibal-brass Guillaume balance with ''winged'' arms, gold temperature adjustment screws and platinum mean time screws, special alloy Breguet balance spring with inner and outer terminal curves, diamond endstone, ''swan-neck'' micrometric regulator. Stamped twice with the Seal of Geneva quality mark and movement also numbered twice, as per Geneva Observatory requirements.

Signature Dial, case and movement. Dial by Stern, bow with PPC stamp.

Accessories Extract from the Archives, Beyer certificate from 1987, copy of the Observatory timing Certificate.

Notes

What makes this example as well very special is that the movement is gilt finished combined with the silver case, as confirmed by the two Beyer certificates. I haven’t seen such a combination yet.
This timepiece is accompanied by the following five documents, which makes it more special and confirms its originality and history:
1. Patek Philippe Extrait des Archives which quotes: “Geneva Observatory Timing Contests: 1st class test result in chronometer performance and honorable mention, manufactured in 1921 and sold in 1938.
2. Observatory timing Certificate which quotes “mention honorable”, Régleur C. Batifolier.
3. Patek Philippe letter to Beyer Chronométrie from 1987 confirming the originality.
4. Beyer certificate dated 1994, confirming the originality of the watch and that the movement had been serviced at the Beyer atelier
5. Beyer certificate after 2017, confirming the Patek letter from 1987, the Beyer certificate from 1994, the Patek extract from 2017, the originality of the watch and that the movement had been serviced at the Beyer atelier

This Patek Philippe Deck watch is certainly a great addition to every high-class collection, due to its uniqueness, quality and documented history.