That's a tricky one, but I lean toward it being fake because of the lower obverse rim. You just don't see that on these proofs.
SuperDave pointed out some strike weakness, I see it best on the tiara and hair, makes me think that if genuine (I think it is) more likely MS than PR. On the obv rim all I am seeing is some finning on the lower parts, nothing that I think is indicative of a fake.
I bought mine at the ANA show in Chicago. It was from a credible dealer and it also has a CAC sticker.
It is very difficult for me to find blisters in Italy and buy them in USA would cost a 40% more tax and customs