Audemars Piguet: A fine and rare 1920s 18ct. white gold keyless digital calendar dresswatch in slim plain case, the front cover with apertures for minutes and jumping hours, day, date and month, date change buttons in the rim, the snap-on back numbered 39584 A5M the polished nickel plated movement with bimetallic balance and jewelled to the centre, similarly numbered, and signed under the dial, import mark Glasgow 1929