Mosin-Nagant Model 1891 socket bayonet, First Pattern with metal scabbard (1e model M1891 met stalen schede)

designed for the Mosin-Nagant Infantry Rifle. These are pre-1918 as opposed to the post-1918 type that had a integral push-button/spring latching mechanism instead of a locking ring. The tip of these bayonets - both patterns - can be used as a screw-driver.