Fine and rare Swiss gold calendar pocket watch Circa 1880

Gold calendar watch
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A rare Swiss yellow gold half hunting cased keyless calendar watch with retrograde date and moon phases, circa 1880. Gilt movement, lever escapement, bimetallic compensation balance, wolf’s tooth winding, 18k yellow gold cuvette.
White enamel dial, Roman numerals, outer minute track, subsidiary dials for constant seconds and month, retrograde date, apertures for day and moon phases, plain 18k yellow gold half hunter case, the reverse with later monogram, signed and numbered Merrier & Fils.
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Diameter: 51 mm
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Signed: Merrier & Fils