Some of the Korean stocks had similar look to this to get rid of the paint marks. I don't know if that's what it actually is or not, but it sort of looks like it. I know many of the Korean stocks I've seen for sale look like they've been hit with a belt sander to varying degrees. I'm not talking about this one, but it's a shame what's being done to many of these old military issue wooden stocks I see for sale. I wish sellers would just leave them alone and sell the things as is, that way the buyer, who you'd hope has a clue, can do what they want to with it.