Looks old. Other then that likely real. I guess in theory somebody could have put the label into the suit. If you're really worried ask for the inside pocket label.
Other then that make sure it'll fit you. It was made for somebody else and that can be good or VERY bad . All depends on how close you are to the guy who ordered it.
That was initially my thought of suit looking dated. I just have normal Ermenegildo Zegna suits but never had experience with "Su Misura" so I had to ask. The jacket size seems fine for me, but the trouser is just way too big.. oh well. Thanks for answering though!