Try contacting the original ebay seller of the chip (along with other chips, jetons, plaques and ivory from the Caro collection). You can contact him through ebay.
His ebay name is superblaireau.
Here is a link to one of his current auctions:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=3488&item=2947143715
I have a quarter that says the chip is Lebonese
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