Everything looks original except chrono hand. Not sure what has happened to the minute markers between between 12 and 5. ?? water damage. I would be interested to see what other members think. The dial is a bit of a let down for me. Judging by the watch case back gasket the watch would be in need of a service. Can't really tell if its been polished but some shots of the case back and sides of watch may help here.
Looks original to me. But the chronograph second hand is not correct for this model. Rest seems OK. But not the best example out there. Dial and hands are dirty. Case seems polished. If I were you I would look for other Mario's.