The "1968" is not a copyright date, but the date of the licensing agreement allowing them to use names and logos. The blue backs were issued in 1970. The black backs were issued (mostly) in 1971. In 1978, Good Humour did a promotion that gave away new cards for the 1971-1977 World Series, and in 1979, Robert Laughlin sold complete sets of all 75 cards direct to the public.
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