Do you really believe that Vandoren would allow a mouthpiece in that condition to be sold?
Vandoren V16 Alto saxophone mouthpiece A6. Opening 196 (1/100 mm), medium long facing length, medium chamber.
"Ebonite mouthpiece for jazz in the tradition of the famous American Alto saxophone mouthpieces of the fifties."
Bought new about about 3 years ago, always used with mouthpiece cushion.
I'd be more concerned about that ridge that runs all the way round, the other hole looks like an injection molding point that hasn't been finished properly (or at all).
How does it play? If it plays well, it's not a problem. Personally I doubt very much that a small imperfection like that on the inside of the piece would make any difference.
Those sanding marks look really bad, and something i doubt any mouthpiece maker would have done, mind you whoever did do it you would have thought the first "modification" would have been to remove that "sproo" from inside