Louis Audemars. A fine and heavy 18K gold hunter case perpetual calendar keyless lever watch with moon phasesSigned Louis Audemars, Brassus (Suisse), No. 11'601, circa 1871 Three quarter plate nickel-finished fully jewelled lever movement, gold cuvette, white enamel dial, Roman numerals, four subsidiary dials for month and leap year, day, date and moon phases with lunar calendar and constant seconds, circular engine-turned case, small circular cartouche with engraved initials to the front, case stamped A.F. & Co. for Audemars Frères and numbered, cuvette and movement signed and numbered57 mm. diam.