Cal. 2120/1 nickel-finished lever movement 36 jewels 21K gold rotor the gilt dial with applied diamond-set numerals four subsidiary dials indicating month day date and phases of the moon combined with lunar calendar in circular case with diamond and baguette-cut sapphire-set bezel the back secured by four screws 18K gold Audemars Piguet integral woven bracelet case dial and movement signed