This СШ-40 is another nice and rare example of that factory ( less than 20% of the helmets was made by that factory).
Very interesting that the date isn't marked inside of rectangular stamp, and is placed on the back part of neck guard apron. The same type of badly visible markings pressed to the shell, as a typical for all the ZKO factory made helmets.
Note: most part of this helmet has reissued steel springs/plates which fasten the liner to the helmet shell from a cut of the Sch-39 liner's rings.
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