Colnago and Masi both switched to 3ttt about 1973 or so. At some point? Returned to Cinelli.
Masi obtained brand stamping on the bars and the Falerio signature stem was worked in, and M decorated 3ttt saddles.
the 3ttt saddles were not very popular, a bit hard and a different enough shape from the Cinelli that they were often swapped out.
There are a number of Peugeot UO8's sold by the shop I worked for that sport M embossed 3ttt saddles.

For me is was finding the bar shape I liked, The Merckx bend 3ttt in the SL was nice but not available when I wanted it.
The Cinelli #63 became my preferred road shape.