I have the opportunity to buy this Security 6 for $250.
It appears that this someone used the gun as a drill press and marked it with the 2 small indents you can see. Would you buy this gun?
I'd pass. Not because it would cause a problem, just because I couldn't stand looking at Bubba's handiwork. You can pick these up for three hundred if you look around for a while. Everyone wants what's new and these aren't.
Always happy for another stainless beater and we see folks here all the time saying what is a good cheap gun for those who don't have a ton of money. When you find one of these folks who you feel for you can resell it to them and know you have done a good deed and saved someone from buying a jimerez or whatever other POS new guns are in this price range. I actually keep a gun or two like this in the safe for such occasions.
If you wanted to one could tig weld up the blemishes and re-finish or JB weld them up and ceracoat or whatever.
Laban, you are far more concerned with looks than I am! I would not give the marks a second thought, and couldn't care less what anyone else thinks if it shoots well.