Desperately needed is an early Zeus Criterium crankset like the one on the CR site:
http://www.classicrendezvous.com/
This crank looks like a TA Cyclotourist or Stronglight 49.
It's practically the last item needed to complete a late 60's or early 70's Zeus Mexico road bike.
Any condition will do. Buy or trade.
Amir Avitzur
Ramat-Gan, Israel