Everything I can see from it it seems to be an original Giovanni Battista Piranesi print. It is the right size, right paper, and right everything from what I can see. I'm going to get it checked out by some people I know.
Do you see the plate impression marks on the border. It's the easiest way to find out if it's real. The etching part should be pushed down or sunken into the paper leaving the edges raised with a small bevel.
Do you see the plate impression marks on the border. It's the easiest way to find out if it's real. The etching part should be pushed down or sunken into the paper leaving the edges raised with a small bevel.