A sport-driven take on Ulysse Nardin's Marine line, the reference 333-55 pairs a 43mm stainless steel case with a black dial and the uncommon appeal of a perpetual calendar in a robust format. The design stays crisp and purposeful, with the dark dial giving this watch a more technical, contemporary character. Its automatic movement carries both date and perpetual calendar indications. At 14mm thick, it wears with solid substance while keeping the profile balanced on the wrist.