Russian bayonet stamp

[Matchka]

Submitted to a FB SKS group. Would this be a correct translation of the stamp?

[Phosphorus32]

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?

[Matchka]

Owner sez it's a Russian.

[Greatguns]

Sure it's not just a trademark stamp, (R)? 

[Justin Hell]

Could it stand for Brezhnev? 

[Matchka]

File under another 'unsolved bayonet stuff'. ;-)