As I move into the sale-by-series era (an era that had passed before I ever bought a pack of cards) I need to try to get a better handle on some things.
I have found several 1972 racks - including the one here - that feature cards from different series.
So, apparently sale-by-series was not an absolute.
Did all series following series 1 contain a mix? Were wax packs, perhaps, 'pure' by series, and did only racks or others contain a mix? It would ad to the scarcity explanation of high series if even high series packs were watered down with earlier series cards.
Is there any rule of thumb other, perhaps, than to say something like - while cards were marketed by series, each year some packs wound up containing a mix as Topps tried to get rid of earlier series cards?
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