I have the 1956 set but so far have not completed the alternative back series in both stocks. I did send Levi a link to this thread. In his view the white backs from 101 to 180 are printed on an entirely different card stock than the 1-100 white/grays and the 181 to 340 cards, and that the 101 to 180 cards don't look or feel like either the 1 to 180 white/grays or the 181 to 340 cards
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