Originally Posted by
FBinNY
In any case I suspect that the fork isn't original to the bike for a number of reasons. First the frame has fender eyes while the fork doesn't, and It would be unlikely for a builder to mismatch it that way. Also the fork and frame use different brand dropouts, and lastly the tube finish at the dropout is different in the fork vs. the rear triangle.
Could be that the builder use a pre-manufactured fork. When did those become commonly availible? (Although Campy dropouts on a pre-manufactured fork is somewhat interesting.)
At this point we'd probably learn the most by knowing the width and threading of the BB. And it there is any fancy lugwork there.