Just was this on eBay. Auction over soon. Too big for me. I collect 11 x 14 inch lobby cards (like here: http://www.antiquegamblingchips.com/lobbycard.htm ).

It is from the movie A Big Hand for the Little Lady (called Big Deal at Dodge City in UK). Famous movie. Auction here:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=25470&item=7517546568&rd=1

I know nothing about the seller.

Robert