Swiss sterling silver open faced keyless pocket watch Circa 1876

Sterling silver cylinder pocket watch
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A Swiss sterling silver open faced keyless pocket watch, circa 1876. A plane case, polished bezel, band and back, engraved silver cuvette by Patek Phillipe & Cie. White enamel dial with radial Roman numerals, outer minutes track and blue steel spade hands. Frosted gilt, bar calibre movement, ten jewels, wolf’s tooth winding, cylinder escapement, plain three arm gold balance, blued steel flat balance spring, index regulator. Case numbered, cuvette signed and numbered.
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Diameter: 50 mm
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Signed: Patek Philippe & Cie.  Genève
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Accompanied by the Extract from the Archives