Ca. Ø58mm, ca. 134g, very solid screwed case No.7773, signed and excellently preserved enamel dial with 32h power reserve indicator, decentralised seconds, signed very high quality 3/4 plate movement, rare pivoted detent chronometer escapement, movement number 7773, marked 'CHRONOMETRE', large chronometer balance with gold screws, blued Breguet hairspring, screwed chatons. Almost all of these Ulysse Nardin deck chronometers known today have a lever escapement. Very few of these watches were equipped with a chronometer escapement.