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GenoThere are actually three different backs - Black Factory 649, Red Factory 30, and Black Factory 30. The Black 30s are by far the hardest, and I'm not sure if they exist for each card. My guess is that they do, but not knowing how they were produced means I can't really confirm it. I do have one card with all three backs, so I know that is possible. As far as cost premiums, I don't think there is one since nobody but a few goofballs like Lee and I are looking for the back variations. At least I haven't seen any premiums attached to any backs yet...
Take Care, Geno