Matt,
Blank backs are problematic for me. I own two. Both I consider blank back. Normal card stock for t205, smooth back, just no printing. But i have seen others that appear to be skinned (or had ink bleed through). I have also seen one that looked like it had paper added to it. I have seen about 10 blank backs that I think are true blank backs. Not sure about others...as a result, I feel that the % is insignificant. I also feel that blank backs were never released into packs either. If I recall, it would have violated the law to put blanks into the packs (something about the factory numbers) but other collectors might know more about this. I feel blanks were scrap never intended for packs.
Joshua
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