Well, I finally got a price and some details:

"The one from Rhodes was just for size comparison. It is a chip from the casino on the island in Greece. I only have one chip and as far as I know it is the only one that left the ship last week. The picture I sent you are front and back. I can't imagine that there more then a handful of these out there. Please feel free to call me if you have any questions 781-xxx-xxx.

"My asking price is $3800"

Robert
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Robert Wilcox and Helen Mack in "Gambling Ship" (1938). (Helen Mack appeared in my favorite film of all time, the Cary Grant-Rosalind Russell screwball comedy, "His Girl Friday" (1940). Mack played Mollie Malloy, the girlfriend of the condemned prisoner.)
http://www.antiquegamblingchips.com/StillsB_OtherMaleActors.htm