I present you my Russian Ssh 40 helmet.
This helmet is in a very good condition despite his age. It was made in 1956.
I found Ssh stands for stalnoy shlyem and means steel helmet.
The model 40 has been in use from 1940 into the seventies.
The Ssh 40 was the successor of the pre-ww2 Ssh39. The only difference is the used liner system.
For pictures of the liner see part 2
Russian helmets compare