This is the same Chance that sold in November 2004 in the Old Judge auction here:
http://www.oldjudge.com/archive/200411/baseball/11/
Obviously here it has been authenticated by JSA, who I normally trust. But I really find provenance is such a big deal with signed T206 cards. For example, having a substantial number of my signed T206 cards coming from the Jeff Morey collection -- either directly or indirectly -- really helps me enjoy my collection without the worries associated with authenticating signed items.
Frank Chance died in 1924. His signature on anything is really hard to find, let alone a signature on a T206 card. Candidly, I find it very hard to believe that he actually signed this one.
While I would be most happy to add this one to my collection, I try to include the likelihood of authentic as a percentage in my bids. In this regard, this one takes a hit. If two or more bidders place a higher likelihood of authentic on it, then there is no way my bid would come close. Which is to say that I may bid on it, but I strongly suspect a couple of autograph collectors will outdo me on this one.
Now, if you can find me any one of Morey's Cobb cards that he had signed in person in Cooperstown, I'll send you my Plank!