This is the Russian Mosin-Nagant Model 1891 socket bayonet - Second Pattern - designed for the Mosin-Nagant Infantry Rifle. These are considered Communist Russian (post-1918) as opposed to Imperial Russian (pre-1918). The post-1918 type - or Second Pattern - utilizes an integral push-button/spring latching mechanism instead of a locking ring as on the Russian Model 1891 Mosin-Nagant Socket Bayonet (1st Pattern). The tip of these bayonets - both models - can be used as a screw-driver.
The Mosin-Nagant Model 1891 Bayonets - and variants - were used from 1891 into WWII. This bayonet was also used by Austria and Finland.