Swiss gold perpetual calendar, moon phase watch Circa 1880

Gold open faced lever pocket watch
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A yellow gold open faced perpetual calendar watch with moon phases, circa 1880. Manual winding nickel lever movement, jewelled with some set in chatons, white enamel dial, Roman numerals, outer minute track, subsidiary dials for the month including leap year, day in Spanish, date and constant seconds combined with an aperture for the moon phases, 18k yellow gold open face case, reeded case band with correctors, engine-turned case back with applied monogram, gold cuvette, case, dial, movement, and cuvette signed.
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Diameter: 51 mm
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Signed: Mantadon  Locle