Are you certain the black is legitimately under the green text?? With the relative 'slickness' of the green ink as compared to the super absorbency of the dull, non-coated cardboard, it seems likely the card was written on by a kid with a magic marker and it isn't some bizarre printing variation. That would account for the black marker being murky on top of the green words. Occam's razor and all that. Plus, there was no black ink (black plate) involved in the printing of 1975 Topps backs.
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