It seems like at max it's 7/8 of an inch but it also drops at certain points to 3/4. It's not smooth or consistent, but maybe the piece that I have is broken. If it has paper backing throughout I think it would have to be consistent.
Maybe it is stone or concrete? How can I tell?
Did you see...
It feels almost like a rock or concrete but I don't think it's heavy enough. Here's a piece of the paper backing:
nealtw - I haven't tried any anchors yet because I didn't know which would be the most appropriate.
I have 2 questions
1. Could somebody tell me what kind of wall this is called specifically?
It seems relatively hard and maybe has a coat of plaster on it? My house was built in the early 40s
2. What is the best kind of wall anchor to use? I'm mounting relatively light...