A gold half-hunting cased keyless lever watch, Patek Philippe & Co., no. 45451 circa 1875

18k, frosted gilt moustache lever movement, bi-metallic compensation balance, wolf's tooth winding, gold cuvette, white enamel dial, Roman numerals, outer minute track, subsidiary seconds, blued steel hands, half-hunting engine turned case with black enamel Roman numerals and coin-edged band, crowned shield to the case back, cuvette signed and numbered, dial signed.