The Nahkampfkanone 1 was an experimental Swiss main battle tank that saw service between 1944 and 1947. Only one was ever built. The designed heralded from early experiments made between 1943 and 1944 in Switzerland in the design and construction of an armoured vehicle. The Nahkampf cannon 1 was built onto the chassis of the armoured car Panzerwagen 39 type LTL-H CSSR armoured fighting vehicle. The chassis was extended by a roller produced by the company Berna in Olten. Since only a few parts were available, it was partially constructed using parts of armoured cars, mainly the chassis and transmissions. The armour consisted of only thin sheet metal and, in initial experiments, only a 75-millimeter cannon was installed, before future designs sported a 10.5-cm howitzer. The prototype was use