Didn't we see this gun with these "The Greek" stocks in an earlier thread here not too long ago?

I think we can ignore the stocks as we have no idea whether these were even originally made or meant for this Victory.

The key is the number on the side of the frame and the word or acronym on the backstrap, which I can't make out partly due to the misaligned stamping and partly the angle and lighting of the photo.

Something like ? ? P ? N K S maybe? Stumped.