David,
Nice call on the 1rst series issue date.
I have a complete run of The Sporting News from 1968 and in one of the ads at the back of News paper it states the the first series will be issued on March 1rst, 1968.
Also you mentioned that the 7th series was out by labor day during that time frame which would be September 7th.
So it is conceiveable that the series were issued in the first week of each month starting in March and ending in September.
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