The Steyr M1912 is a semi-automatic pistol developed in 1911 by the Austrian firm Steyr Mannlicher and designed by Karl Krnka, based on the mechanism of the Roth-Steyr M1907. It was developed for the Austro-Hungarian Army and adopted in 1912 as the M1912. It was in service in a limited capacity for the Wehrmacht until the end of World War II. The Steyr M1912 is usually known as the Steyr-Hahn (Steyr-Hammer). Ostensibly this is because of its external hammer but contemporary designs and indeed earlier Steyr designs also used an external hammer, so this is open to debate.