http://www.ebay.com/itm/1930-s-GAME-...vip=true&rt=nc
Seller listed as "Crosby" on the tag, and it could just be me seeing dead people, but rather than Crosby, could that be "C. Posey".
The jersey itself has CUG, which I know could have been the Chicago Union Giants, but they I believe were gone by the time this jersey would have been made. So not sure if this was a negro league jersey or not.