What do we know about marking Polish signal ammunition in caliber 26mm?
It seems that everything.
Simple repetitive marking the same for many years:
@12h code producers caase in oval
@6h two digital code years production case
Used from c. 1953 to 90’s like this:
But before 1953 we have most interesting HS like this:
from unknown producers with code (26)
and from (361) on another orientation code
and from new production :