There is currently a "near" master set up for auction at Heritage and they claim, in order to finish it, one needs the Red back Page/Sain bio and the Red back Sain/Page bio cards.
Is this just a typo/error where they meant to type black back instead of red back? If not, this is the 1st time I've ever heard of these wrong bio cards being printed on red back cards.
https://sports.ha.com/itm/baseball-c...umbnail-071515