A 1974 GC would have come with an NR group as standard. 1974 was the first year for SR, are the components dated to 1974? If they are all '74 dated, with titanium BB spindle, and in excellent condition, the group may be worth $850.
If the frame and fork are in good condition, $650 is a good deal!
Last edited by Kactus; 08-23-16 at 02:53 PM.