Originally Posted by John E
Make that "Swiss-threaded" in the bottom bracket, i.e., English-style reverse-threaded fixed cup, but with 1mm / 25.4TPI thread pitch, instead of 24 TPI. The French finally it right (left?) later in the 1970s.
I was under the impression that Swiss threading was very rare by the '70s, but you could be right. Digging out my old Sutherlands Manual(1977) it has the cryptic "Switzerland - French unless listed separately" under threading standards. But it also has the useful information that the Swiss Campy left threaded fixed cup will be marked "35 x 1G" and the French fixed cup will say just "35 x1".