French rose gold triple calendar with moon phases Circa 1900

Open faced triple calendar lever with moon phases by Eugene Boussion
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A French 18 carat rose gold open faced triple calendar keyless lever pocket watch with moon phases, circa 1900. Nickel finished jewelled lever movement, bimetallic compensation balance. Inscribed rose gold cuvette. White enamel dial with Roman numerals, outer minute track with Arabic five minute divisions, three sunken subsidiary dials for date and day in French, constant seconds combined with phases of the moon. Polished case, monogrammed to the hinged back. Cuvette signed and numbered.
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Diameter: 52 mm
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Signed: Boussion