Ted,
Having personally assembled a good number of bars to stems and then brake levers to bars while working at Masi, I can say that it's next to impossible to be possible. All of the groups shipped to Carlsbad were dated 1973.
Brian Baylis
La Mesa, CA
Check out this Masi this guy is selling: 7177419010. Does anyone know if any of the Masi's built in California had the first generation Campagnolo brake calipers (non-engraved style on them?)
Ted Baer
Palo Alto, CA