The two reports I have found online regarding these chips both seem to indicate that at least some of these style chips were used on the ships.

Here are the relevant sentences I have found:

THE CAESARS CORPORATION JOINED THE CRYSTAL CRUISES FOR THEIR CASINOS IN THREE DIFFERENT VESSELS, THE HARMONY, THE SYMPHONY AND THE SERENITY. THIS CHIP DID NOT SEA MUCH GAMING ACTION AT SEA SINCE THAT PARTNERSHIP FAILED AFTER A SHORT TIME.

Some of these chips used briefly in the casino before it closed.