Could be just after 1980. Look at the 81-83 catalogue:
https://docs.google.com/file/d/0B41COrvE5iuAOEdpbGQydlRzbWM/edit?usp=sharing
but couldn't find one like yours.
The "modello Gran Sport" is exactly the same (except from the colour): Tretubi tubing, Gran SPort groupset, chromed part of the seatstaylug, chromed top of the sprayed fork, Selle Royal saddle, Monthlerey rims...
Thanks!
@anidel started
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Could be just after 1980. Look at the 81-83 catalogue:
https://docs.google.com/file/d/0B41COrvE5iuAOEdpbGQydlRzbWM/edit?usp=sharing
but couldn't find one like yours.