[ALR-bishop]

As I said earlier, I see a lot of front differences in the first series depending on whether the card is a red or black back, but had never heard about grey faces versus clear faces in the black backs.

But, Saved listed a link from a George Vrececk article which discusses his theory that due to the Sain/Page error, Topps likely did do a second printing of the black backs. I have a lot of respect for George's work in the variant arena. In the article he discusses the differences in color background of the Boone and Kretlow cards...and those differences do exist. If there was a second printing of the BBs then there likely are other minor color differences. Not sure though about grey faces other that in the latter Canadian series.

But, interesting discussion anyway