A mechanical solution of the utmost elegance, favoring technological simplicity and ease of use. The case of each Ulysse Nardin timepiece is individually numbered on the side. Marine Chronograph annual calendar is mechanically programmed for one year: it recognizes months composed of 30 and 31 days, but not February. It therefore only needs to be corrected once a year. Marine Chronograph annual calendar is presented on a rubber strap with an 18 ct rose gold 5N element and an 18 ct rose gold 5N folding buckle.