The TP (Taschenpistole, or "Pocket Pistol") was made in .25ACP from 1961-1971 (11,253 made) and in .22LR from 1967-1969 (3,417 made). It is a single-action, fixed barrel, striker-fired, blowback pistol. The firing pin sticks out at the rear of the slide to indicate when the pistol is cocked...