The 'shi mark.. never seen one person. Nice
I've always had good luck with Allen's, great guy to deal with.. It might cost you a hair more than the average going price, but, you definitely wont be disappointed with what you get.
Once and a bluemoon these pop up in my area....usually they have been utterly destroyed, turned into some wackjobs 500 dollar Crapco camo extend-a-stock wannabe sniper.
I do like the Type 53, usually they are like gorilla weld, very tough and very ugly, because pretty ones are few and far between. I bought 2, got a '54 and a '55 from the first Albanian batch, it was a crap shoot, because some had crappy bores. Both the ones I got, have beautiful bores, even though outside, they are uglier than 3 day old sin..
One has a red/yellow paint mark on the butt plate and a rack number painted on the butt, another one of those mystery marks, something I'd guess was Albanian done. I've seen a few pictures of similar marks, but no one has come up with a hardcore logical reason what it means.