I can't see the OP's picture at work, but I recently went through and opened a bunch of US mint sets from 1970 to current date.
-1970 has separate red and blue plastic tokens with each mints name on it. There was two tokens because only one
Kennedy half was in the set leaving room for 2 tokens.
-In 1971, that set had two
Kennedy halves and only had room for one generic us mint plastic token.
-1972 was the same as 1971 with only 1 generic token.
-In 1973 they did away with the tokens to make room for the
Ike dollars.
Eventually they switched to the stamped copper token which could be confused as a cent, not sure which year(s) though....
So from 1970 onward, I've only seen the plastic tokens in those 3 years from 1970-1972. I'm not sure about pre-1970 sets.
Edited by trent
03/18/2014 07:47 am