Deduction for player with possible back?
 

I tried to post this on T206Resource but couldn't get past the image verification to send them an email (?) I don't have colored keys, so not sure what I was missing so thought I'd do this here.

I see that Chappie Charles is listed as a probable no print (or possible not confirmed) with Old Mill back. I have a Frank Smith Chi & Bos Old Mill back with a "Charles" wet sheet transfer on the front. See attached images. It's not definitive but maybe it can be deduced that a freshly printed Charles with OM back was laid on the OM sheet with Smith?

Anyway, thought it might be interesting.