Swiss 18 carat rose gold open faced pocket watch Circa 1905

A fine Swiss 18 carat rose gold open faced keyless pocket watch made by Patek Philippe in Geneva, circa 1905. The manual wound jewelled gilt movement with a moustache lever escapement, cut bimetallic compensation balance and an index regulator. White enamel dial with Roman hours, an outer minute track, outermost Arabic five minute numerals, subsidiary seconds at 6 o’clock and spade hands. The case with an engraved hinged rose gold cuvette and guilloché back with a central cartouche. Case, cuvette and movement signed and numbered, dial signed. Comes with an Extract from the Archives.