Swiss silver lever with perpetual calendar and moon phases Circa 1980

Silver complicated lever watch by IWC
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A Swiss silver open faced lever pocket watch with perpetual calendar and moon phases, circa 1980. Jewelled lever movement, keyless winding. White enamel dial with Roman hours and outer minute divisions, subsidiary dials for the phases of the moon, days of the week, date and months combined with constant seconds. Plain case. Dial signed, case and movement signed and numbered.
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Diameter: 56 mm
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Signed: International Watch Co Schaffhausen Swiss