I'm a little skeptical as well but someone may have swapped in the levers for the sake of "safety." Colnago decals are pretty common on eBay. Ernesto has never been shy about puting his name on his bikes. Look for engraving on fork crowns and seat stay caps as well as head lugs.
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“Life is not one damned thing after another. Life is one damned thing over and over.”
Edna St. Vincent Millay