AUDEMARS PIGUET. AN 'ULTRA THIN' ART DECO 18K YELLOW GOLD POCKET WATCH . Case Serial Number: 19867. Date: Circa 1930's. Movement: Signed 'Audemars Piguet', ultra-thin, 19 jewels, numbered 19867. Dial: Signed, silvered, gilt applied Arabic numerals, gilt Breguet hands, minute outer counter. Case: Signed, 18K yellow gold. Size: 41mm. Weight: 63g. Accompaniments: 18K yellow gold chain.