I have been told it's from 1979 or 1980 by an expert in Holland, but I'm sure there are some Colnago experts out here who will be able to date it more accurately...
I am more into my Dutch Road bikes, I used to live on the Haarlemmerstraat in Amsterdam in the seventies, 2 min away from the RIH shop, when I was a young boy I spend hours staring at the beautiful bikes and frames in the shop..could never afford them until I was a teenager and then got a second hand one..still want to get myself a Zieleman, Presto and RIH again..