My best guess is that there was more than one printing, maybe even at different locations, maybe that is why there is a difference in brightness/dullness. I pulled a hand full of 1975 topps cards that I had multiples of, some there were significant differences like the Harrah's, some there was no difference? I would not consider that a variation, however, I guess it might have similarities to the 1962 Topps green tint variations?
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