According to the Steyr factory records this arm, patented in 1898, was originally introduced as the "Model 1900" and used a special 8 mm cartridge.
Steyr | Steyr-Daimler-Puch | Steyr Mannlicher | Steyr AUG | Mannlicher | Steyr TMP | Steyr-Land District | SK Vorwärts Steyr | Pumhart von Steyr | Magna Steyr | Ferdinand Mannlicher | Steyr-Mannlicher M1895 | Steyr 100 | Mannlicher-Schönauer | 6.5×52mm Mannlicher-Carcano |