Automatic Suomi M / 31. Developed by Finnish gunsmith Aymo Lahti. In the Finnish army was adopted in 1940.
But other weapons are about the same time. But appeared a little later.
7.62-mm pistol-machine gun of the 1941 model of the Shpagin system (PPSh) submachine gun, developed in 1940 by designer GS Shpagin. The Soviet machine gun with which the Red Army passed the entire Second World War. I met in the army even in the sixties ...
Very similar, is not it?