Old steel 3 arm cranks, the type that was popular from the 30's through the 70's, had a 116 BCD pattern. That enabled 36 tooth inner chainrings and "compact" cranksets.
Zeus used a 5-arm 116 BCD pattern on their Criterium cranks from the 60's through the 80's. So Zeus cranks could be used on touring bikes as well as racing bikes, without modification.
When Campy came out with their 116 BCD 3-arm Gran Sport cranks, in both aluminum and steel, they didn't bother making small chainrings.
I never understood why Campy didn't go after the non-racing markets until their Gran Sport/Triomphe/Victory Groups.
Amir Avitzur
Ramat-Gan, Israel