I have machines from the three major companies from 1950 all the way up to the mid 70s but taking a head count most are Williams from the mid 60s and prior. There are some more Gottliebs from the 50s that I would like to get some day and some 60s Ballys that also look pretty cool.
I may be in the minority, but at this point there are no more 70s 3 inch flipper games from any of them that I will be looking for.