A 1972 Topps card with no black ink on the front and a blank back is a progressive proof card, but there are 1972 Topps cards with nearly no black ink on the front with full backs that got past quality control, but every one that I have seen has slight traces of black ink and aren’t completely blackless.
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“interesting to some absolute garbage to others.” —- “Error cards and variations are for morons, IMHO.”
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