It is my understanding that Topps used packaging left over from the previous year on more than one occasion. For example their use of the '74 wrappers on a decent amount of their '76 baseball. I have seen an awful lot of this from the '79-81 football. On some of their '80 rack packs which hold three packs, you see the '80 rack pack wrapper but some have '79 packs and some have '80 as they are visible from the back. Anyway, I'm no expert on this stuff, but there are a few guys who are, so hopefully someone more educated than I can chime in.
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