Update:

So for the moment, the IT range stands at 32 models :

1976..........IT400C.

1977..........IT175,250,400D.

1978..........IT175,250,400E.

1979..........IT175,250,400F.

1980..........IT125,175,250,425G.

1981..........IT125,175,250,465H.

1982..........IT125,175,250,465J.

1983..........IT125,175,250,490K.

1984..........IT200,250,490L.

1985..........IT200N.

1986..........IT200S.

1987..........IT200T.

Cheers,

Dave R.