So. As a Stone Mason …I sorta feel obliged to point out that, sorry, that is a BRASS sign.

Good news is it’s almost certainly been attached with 2 shortish pegs into the stone and some chemfix, epoxy or the like. Also a good chance there’s no pegs at all and it’s just epoxied straight to the stone…

Either way, crowbar will, hypothetically, take that right off with no issues.