Swiss 18K pink gold open faced lever chronograph Circa 1867

Pink gold chronograph pocket watch
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An early Swiss 18 carat pink gold open faced keyless pocket watch with chronograph made by Patek Philippe in Geneva, circa 1867. The chronograph is activated through the crown, a safety bolt locking the chronograph functions by a slide at 1 o’clock. White enamel dial with Roman hours, an outer minute track with fifth of a second divisions and Arabic five minute numerals, sunk subsidiary seconds at 6 and blued steel spade hands. Rhodium plated movement with 26 jewels, a counterpoised straight line lever escapement, cut bimetallic compensation balance and blued steel flat balance spring, a visible chronograph mechanism. Dial signed, case and movement signed. Comes with an Extract from the Archives.
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Diameter: 50 mm
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Signed: Patek Philippe Genève