Gaucho
It's not much known that Gottlieb's GAUCHO, designed in Autumn 1962 and manufactured from January to March 1963, is with a production-run of 5,350 the most-produced machine of the 1960's and was previously only topped by Flipper-Games Humpty-Dumpty and Lady Robin Hood.
Most units went to Europe, especially to France where it was very popular.