Originally Posted by
guygadois
There are two holes for water bottle brazes but it looks like they were added later? The rear DO is a long Campy. Everything as you see is how I picked it up. I am going to strip it of parts soon. Funny about the cable guide. The serial of another frame 11042 was dated 1974 and this number is 10812 so I would assume it is pre 1974. Make sense?
Guy
Having worked for a shop that sold Bob Jackson frames in the 70's visually it could be 1972 to 1974.
They were cranking them out, (I think they must have subbed some too) in 1975 Bikecology in Santa Monica bought a big load of them and we stopped ordering.
My suggestion is to be careful and inspect the bottom bracket as it goes together if you use a typical period assembly, the shells were often distorted, the shell faces were not parallel and a cup would seat but not perpendicular to the spindle. If that is a problem then using a Phil Wood BB or similar will solve the problem.