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[Pobeda45]

Also word "wyuchka"... It's a rare, if not archaic word, and I haven't seen it anywhere else than in a dictionary. unexpected find in the official document from 80's.

The word worries me less, as uncommon as it is. About the only context it's used in is "boevaya vyiuchka," for example:
http://www.rg.ru/2008/09/26/reg-privolzhe/bastion.html

Good points though, maybe it's official but created by some local military unit. I don't know why else they would use a postal stamp. :)

George