In checking my 7.62 x 54r references,I am unable to find any reference to this head stamp;
Ball- Cws. case ,unplated / washed projectile,HS. looks to be 511(At 12) 45 (At 6) ,and 3 at 9 Oclock.The 511 ? is typical of the Soviet WW 2 production,in that it is some what blured the rest is clear and readable.
Thanks for any help.
SGM. USA. Ret.