Auction was today. The chip went for $3125 even though I don't think it is seen in the movie. Read about it in my post below, here:
http://www.thechipboard.com/index.cgi/page/1/md/read/id/1321357/sbj/500-prop-chip-movie-casablanca-auction-11-24-nyc/

Look there -- I can sell you one that was in the movie, for $3.

Robert
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"NEW ORLEANS" '47 Arturo De Cordova, Dorothy Patrick, roulette gambling.
www.antiquegamblingchips.com/StillsB_OthMaleAcs.htm