Just picked up a Colnago from friend of friend for a case of beer. It looks nice from a distance of a few feet but up close there is some surface rust on the frame and the components. The components are a curious mix of Dura Ace and RX100 (like 105). The Dura Ace is I think early 80s, the RX100 is mid 80s. The Dura Ace components are: Brake levers, callipers, f and r derailleurs, cranks and BB. The RX100 is shifters and hubs. I suspect that it has been "upgraded" to 7 speed index at some point by changing the wheels and shifters. Can't yet find a serial number but loads of pics attached. Any ideas what year and model, and is it worth repainting? Rides very nicely and paint scheme is certainly "unusual". If early 80s frame was it unusal for Japanese component to be installed rather than Campy??