Submitted to a FB SKS group. Would this be a correct translation of the stamp?
(https://i.ibb.co/bv4Z8Tm/Screenshot-2020-09-28-02-19-07-1.png) (https://ibb.co/PW2nfKj)
(https://i.ibb.co/nzZxSWW/Screenshot-2020-09-28-02-19-28-1.png) (https://ibb.co/ChNRFrr)
It didn’t occur to me that it could be an OTK marking. It looks more like a random B to me, an inspection marking of some sort. The others look like partial circles, part of an off-center poorly struck marking perhaps. Did they say the country of manufacture?
Owner sez it's a Russian.
Sure it's not just a trademark stamp, (R)? rofl rofl
Could it stand for Brezhnev? dance2
File under another 'unsolved bayonet stuff'. ;-)