Originally Posted by
Sir_Name
^Agreed, it's odd that only the downtube is crimped rather than both top tube and downtube.
I picked up an E-Bay frame. It was supposed to be a Master, but I'm thinking Nuovo Mexico.
Only Downtube is fluted. It also has an octagonal fluting, while the Masters seem to have a square fluting.
It must have been early in Colnago's using fluting to strengthen tubing.