18k white gold, black alligator strap (unworn) with steel tang buckle, fixed tachymeter bezel, silver dial, manual wind (Cal. 1866 (base Lemania 1874)), 12-hour chronograph, date, moon-phase, NASA First Watch Worn on the Moon engraving, Ref. 3689.30.31, 42mm, also includes worn alligator deployant strap (93% condition with extra hole punched) with stainless deployant buckle, Mint in Box with Papers