Swiss clock supplied to the British Army during the Second World War, produced by the prestigious company CYMA (Tavannes), who in 1915, at the beginning of the Great War, patented the first waterproof watch, much sought by the armed forces of several countries. Equipped with sophisticated mechanics with 15 rubies, revised and fully functional. Complete markings of the British Armed Forces (so-called Broad Arrow) and its serial number assignment. Marking GSTP, well-defined, it means "General Service tempory Pattern", indicative of the watches hastily acquired from the offices of the police at the Swiss factories to meet the growing needs of the Armed Forces in view of the incipient Second World War. Porcelain dial with hour markers tritium well preserved and patina. Brass case with traces of chromium, lost through intense operational use of the stopwatch. Watch model surveyed by the German scholar of military watches Konrad Knirim page. 451 of his book titled "British Military Timepices" (published by "Pomp"). Clock "combat" that can not miss in a collection of militaria important as historical testimony of the British war effort against the Axis troops in World War II