ah-so: I did not realize there was a second series of photos under the first in the blog, and your pointing out the cable-housing idea made me go back and look. I agree that this bike used cable housing to direct the shifter cables, but the housing probably ran on the top-side of the BB shell, note where the stop for the RD is on the chainstay. And that shot of the BB shell leads me to think these probably are Cinelli lugs and BB...plus the frame looks like it could be an earlier product now: early '60s seems likelier.