Ocean Players Club (OPC) was a casino management company for cruise line ships that Carnival Cruise Lines used and then bought. Perhaps the arrangement was more complicated than that, but that chip was a promotional chip used on-board several Carnival owned cruise ships under the Carnival "Fun Ship" brand, Princess and Holland America.
Check out this link to Chip Guide: http://www.themogh.org/cgupdate/cg_chip2.php?id=WTOPOP
Jim
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