Audemars Piguet: A gold automatic perpetual calendar wristwatch in circular case, the white dial with raised baton numerals, subsidiary dials for day, date and month with a sector for the moon with lunar calendar, snap-on back with makers mark No. B73090 and further engraved quantieme perpetuel automatique No. 790, signed movement with gold rim to the rotor, 36 jewels, adjusted to heat, cold, isochronism and to five positions, No. 226437 with makers black leather strap and gold buckle