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DJI just sent a dollar bill expert the following link and will see what he has to say about the following, which was where this originally appeared.
http://www.gameuseduniverse.com/vb_forum2/showthread.php?t=332
There are A LOT of "suspect" signed Babe Ruthand Ruth/Gehrig signed $1 and $2 dollar bills from their playing days. Collectors (and forgers) love items that can date back to that period like wire photos (even though most were leaked in the 1970's), Dollar Bills and First Day Covers (especially 1939 Baseball Centennial FDC's). It makes the collector feel more at ease since "it could have been signed".
DJ