Impressive batch of cap backs! I've been collecting the caps off and on for years, and I don't have any non- coke ones. The Khosher for Passover one should be the toughest, and may be NY area only. RC cola did a similar thing on their cans one year, but only from the New Rochelle NY plant, and only in the few weeks around Passover.
There may also be caps with a built in pull tab that makes a removed one look a bit like a baseball cap. I've only seen them with football players, so they may have given up on them by 67.
I'm not real sure about variations, besides the 67/68 differences. The different bottling plants used different liners, which can make sorting a big batch of one team a little easier.
The 68 set is the only one with the text plays, One of them may be very tough. I think there was some sort of prize for completing the set that was a bit more value than the set of dexter press pics they gave out in 67.
Steve
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