Here's a link to a Chief Bender Letter currently in REA....
http://bid.robertedwardauctions.com/...x?itemid=14148
REA's pre-auction estimate was $400 - $600, but perhaps that was low, considering it already sits at $800 (plus the juice). This Letter is really nice, but so is the one posted above. I know REA realizes top dollar, but perhaps it's still worth a bit more than I initially thought.
Hope this is of some help, and best of luck!