Interesting info. The 1991 Topps set probably has more variations and print defects than any other set. Compiling a complete master set would truly be an accomplishment.
It seems, based upon initial looking at this set the non-glow backs occurred first. After printing some of the Desert Shield set, which was thought to occur early in the print run, they added brighteners to the red ink. I actually have card(s) with brightener and no brightener on the same back.
Variations and print defects are seemingly unlimited
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