Patek Philippe. A fine and rare 18K gold openface keyless lever pocket chronometer with power reserve, Guillaume balance and Bulletin d'Observatoire
Patek Philippe. A fine and rare 18K gold openface keyless lever pocket chronometer with power reserve, Guillaume balance and Bulletin d'Observatoire

SIGNED PATEK, PHILIPPE & CIE., GENEVA, SWITZERLAND, MADE FOR THE SWEENEY JEWERLY CO., HOUSTON, TEXAS, MOVEMENT NO. 161'220, CASE NO. 280'134, MANUFACTURED IN 1911

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Patek Philippe. A fine and rare 18K gold openface keyless lever pocket chronometer with power reserve, Guillaume balance and Bulletin d'Observatoire
Signed Patek, Philippe & Cie., Geneva, Switzerland, made for the Sweeney Jewerly Co., Houston, Texas, movement no. 161'220, case no. 280'134, manufactured in 1911
Cal. 19''' nickel-finished Extra quality keyless lever movement numbered twice and stamped twice with the Geneva seal, 21 jewels, Guillaume balance, micrometer regulator, wolf's tooth winding, gold cuvette engraved Made for the Sweeney Jewelry Co., Houston, Texas, Awarded Third Prize Geneva Astronomical Observatory Timing Contest 1912-1913, white enamel dial, Breguet numerals, two subsidiary dials for power reserve and constant seconds, plain circular case, hidden hinges, case stamped and numbered by maker, cuvette and movement signed and numbered by maker and retailer, dial signed by maker
50 mm. diam.

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With Patek Philippe Extract from the Archives confirming production of the present watch in 1911 and its subsequent sale on 8 September 1914. It furthermore states that the Geneva Observatory rating certificate was obtained on 11 January 1913.

This watch is one of Patek Philippe's few pocket chronometers presented at a Kew Observatory trial: it participated at the 1913 - 1914 timing contest where it obtained 93 points, tenth overall in its category. At the Geneva Observatory timing contest in 1913 it was awareded a 3rd prize, 29th overall in its category.

Precision timekeeping has always been vital to the scientific community, and in 1873, the first annual chronometer competition was held at the Geneva Astronomical Observatory. Rigorous quantitative internationally recognized testing standards were established. The testing, which initially lasted for 40 days, consisted of placing the watches in various positions and temperature conditions. The prestigious watchmakers Patek Philippe were awarded First Prize in the competition as early as 1884.

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