This proof mark ring any bells?

[Shell Shifter]

Russian? Bulgarian? Anyone see it? If so, where?

Thank you.

 

[Slick]

Initially thought German. Might be a reversed photo. Crown doesn't match anything I'm familiar with.

 

[Shell Shifter]

Not reversed. On a Luger pistol. The identification is that it is a Russian contract but I have never come across this proof.

Sorta casting about for anything similar. Here is the most "complete" reference....