I came across this while searching for another site that I called had info on Columbus tubing. The “Doppio Spessore” on the later stickers means double butted I believe.
https://cyclesroland.wordpress.com/2...ecal-timeline/
This is the site I was looking for but it is hard to navigate around.
Columbus tubing full catalog circa late 1970's
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '95 Gios Compact Pro, '95 Carrera Zeus, ‘81 Masi Gran Criterium, ‘81 Merckx Pro, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, Rivendell Rambouillet, Heron Randonneur, ‘92 Ciöcc Columbus EL