This set has multiple cards with a black back variation, see below:
http://www.toppsheritage.com/2008-topps-heritage-black-back-checklist.html
Currently, I don't have a high enough permission to add entrys to an existing check list. I just picked up card #16 Ichiro but only the green back version is in the CL. Would someone be willing to add 16b into the checklist as a variation? Adding all the other black back variations would be large task so I'm not asking anyone to do this, just this one card.
In the future if there is a better way to do this, please let me know. I thought about submitting an "error" report on the set page but thought there might be a member who could do this