I was asked off list about the weird Colnago 6-spider cranks and what date they might be. Thought maybe some others might want to know (or not?).
They (6-spider cranks) are shown on the last page of my reprint of the Colnago folder catalog (they are "Art 115") and I believe the catalog is from 1978.
Chuck Schmidt
South Pasadena, CA USA
http://www.velo-retro.com (reprints, t-shirts & timelines)