The Mauser Model 1914 is a semi-automatic pistol made by Mauser. A derivative of the 6.35mm (.25 caliber) Model 1910 designed by Josef Nickl, it uses 7.65mm (32 ACP) ammunition. [2] In 1934, the Model 1914 was superseded by the simpler Model 1934. Mauser 1914 pistols were used by the German police and military during both World Wars.