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Extremely rare as few as 100 such examples. Not technically a prototype. This experimental mask that was for display only. That has been repaired for use in the intended purpose.
We have here is very rare example imported from Ukraine.
This may have formally been top secret but has since been declassified.
The following mask is very old and fragile so be careful with it. It may have seen service in the Soviet Afghan war.
Titles of Distinction