The Silver C lenses are single coated and were produced from the mid fifties to about 1970/71, the C T. lenses have multicoating Zeiss T-coating both C and CT lenses use the Compur shutter parts problems might arise, Later came the CF line of lenses change to prontor shutter and some optical improvements. The CF line was followed by the CFE E standing for electronic bus. Hasselblad believe it or not introduced a line of budget lenses in the 1990's the CB.
The C and CT lenses are optically great and are also the cheapest to buy. The best overall choice might be a mix of CF and CB lenses. If you have too much money get the CFE and CFI.