Demand and supply will increase the value of unaltered C&V framesets. So many times i see a fantastic C&V frame converted to fixie/single speed by having the brazedon shifter mounts, front derailler mount, chainstay cable guide and rear derailler hanger cut off. Thus the supply of C&V frames for restoration is drying up and therefore the remaining ones should go up in value. We're seeing some of that already as some C&V frames are selling for more than they did new.

Cheers