Swiss gold lever chronometer with power reserve Circa 1911

Open faced lever chronometer with Guillaume balance by Patek Philippe
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A fine and rare Swiss 18 carat gold open faced keyless lever pocket chronometer with power reserve and Guillaume balance, circa 1911. Retailed by Sweeney Jewerly Co, Houston, Texas. 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 with Breguet numerals, two subsidiary dials for power reserve and constant seconds. Plain case, hidden hinges. Case stamped and numbered by watchmaker, cuvette and movement signed and numbered by watchmaker and retailer, dial signed by watchmaker. Comes with Bulletin d’Observatoire.
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Diamete: 50 mm
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Signed: Patek, Philippe & Cie Geneva, Switzerland