Posted By:
DDLet's say for a moment that the other stamp was applied first. And..... An interesting anamoly, for which nothing plausible can be concluded.
It's clear that the one Leon has was part of a sheet used to test the printing press. Multiple times at that, but not more than once for each brand; would probably interfere with proper alignment, or something like that. A unique example of the actual T206 card manufacturing process at work, complete with a wet sheet transfer of Cy Young. Hence the hotly contested bidding.
Imagine you had a 1927 Yankees team signed ball, and Charlie Gehringer signed it. He was around back then, but it doesn't mean his signature belonged on it. Could be a nice story behind it, or Charlie happened to pick up the ball and sign it, put it back in the box before you left for the World Series to get the rest of the ball signed.
Point being, before or after doesn't matter. Unless F. Scott Fitzgerald or Howe McCormick owned this card, that back stamp is nothing but a curiousity, not something that will command a premium, or be collected for the stamp, and certanly not an addition to every known type set list it would belong on if it were a legitimate T206 back.