Color variance was really common on NBA cards up to the mid-90s. Once you reach 1996 or 1997, give or take, it's MUCH less common, but, like any printed material, can still be found with enough searching. Whenever I come across them, I save them but don't mark them as a new card for my collection, unlike mis-cuts, missing foil, etc, which I do very much collect and track.
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VERY slow trading due to health problems. Not transferrable so safe to trade with, just moving is painful and can't always access the cards.
Cardboard History My COMC
New Collection Website: Cardboard History Gallery (Still under construction)
Tips on how to make your scans look like the card does in hand (No more washed out, fuzzy scans!):