You have the tubing listed as 531c. Does it really have the "c" on it? I've read elsewhere that the 531c tubeset came out in the early 80's (1983+/-), meaning a 531 "club" set, with a 531 main triangle and 501 stays (not sure about the fork- although I think it's a 531). This tubeset was around in the 70's? Help me out here.
Nice C&V ride, though.