Patek Philippe. A very fine and rare silver and gold openface keyless lever watch with Guillaume balance and Bulletin d'ObservatoireSigned Patek, Philippe & Cie., Genève, movement no. 161'181, case no. 272'615, manufactured in 1913Cal. 19''' nickel-finished fully jewelled Extra lever movement numbered twice, Guillaume balance with winged arms, micrometer regulator, wolf's tooth winding, silver cuvette, enamel dial, Breguet numerals, outer railway minute divisions, blued steel spade hands, subsidiary seconds, circular case, gold hinges, gold crown, case, cuvette, dial and movement signed51 mm. diam.