I have a C'Dale Criterium series bike that my wife had bought new but can't remember when. It is white with a blue Cannondale lettering across the top tube, has Suntour Accushift derailleurs and shifters on it, DiaCompe brakes and a Sugino crank. Wheels had Mistral rims, don't know the hubs offhand. The rear wheel isn't the original although I have that in my basement somewhere and has a 6sp freewheel on it. I think that is the original setup too, but I'd have to dig out the wheel.

Any ideas when it is from and if it is worth restoring?

The shifters are all frozen, the cables need replacing but the barrels are stuck. The brakes worked OK, but not like a modern bike. I took it for a test spin after replacing the front tire and the rim tape and it rode OK. It is stiff as hell of course. The bike was on my trainer for a number of years and while I always threw a towel over the bars my son didn't, plus the damp basement, and all the exposed components are getting pitted. The frame is clean though.