Swiss 18K gold chronometer with power reserve Circa 1925

Gold open faced keyless lever pocket chronometer by Patek Philippe
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A very fine and rare Swiss 18 carat gold open faced keyless lever pocket chronometer with power reserve, Guillaume balance and Bulletin d’Observatoire, circa 1925-1929. Completed and encased in 1929 and sold on 16 January 1930. Nickel finished Extra fully jewelled keyless lever movement numbered twice (manufactured in 1925), Guillaume balance with gold poising screws, micrometer regulator, wolf’s tooth winding. Gold cuvette. White enamel dial with Breguet numerals, two subsidiary dials for power reserve and constant seconds. Engine turned grain d’orge pattern decorated case back. Case, cuvette, movement and dial signed and numbered.
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Diameter: 52 mm
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Signed: Patek Philippe & Co Genève Chronomètre