Hi Michele
The classic car magazines in our part of the world have been undervaluing Fiat 131s/132s/124s, etc for years and it sounds like the same is happening in Italy.
I have watched 131 values steadily rise in Europe for the past 5/6 years (while I was looking for my car) and in my opinion, if this red Super is a good clean car with no rust, drives well, everything works then it is a good price. I even think you would buy it for ?2000 or maybe a little less. Then if you were unhappy afterwards, you could leave it in Ireland after 3MA and sell it on here where Fiat 131s are more valuable!
Then fly home from Shannon to Bergamo on Ryanair!?