Swiss 18K gold hunting cased complicated watch Circa 1871

Keyless lever with perpetual calendar and moon phases by Louis Audemars
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A fine, heavy Swiss 18 carat gold hunting cased keyless lever watch with perpetual calendar and moon phases, circa 1871. 3/4 Plate nickel finished fully jewelled lever movement. Gold cuvette. White enamel dial with Roman numerals, four subsidiary dials for month and leap year, day, date and moon phases with lunar calendar and constant seconds. 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 numbered.
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Diameter: 57 mm
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Signed: Louis Audemars Brassus