I have a photo in a magazine showing a 14 year old Lemond, in 1976, astride his yellow bike. The photo is head-on and I can describe the head tube like this: painted logo, vertical bar on left with two circles above each other to the right of the vertical bar.I also have photos of him riding his Della Santa but that has DS on head tube.
I had a funny meet-up with Lemond in the Dolomites:
http://italiancyclingjournal.blogspot.com/
Angel Garcia
Long Valley NJ