I talked to Al. Al agreed they were PR. Al said he thought Casino de Caomo. His reasoning was that it was a high class private club in which chips were never found. Other than his hope that he finally found those chips, he had no idea. Al had spent years trying to find the elusive Casino de Caomo chips. I guess Casino de Caomo would be better for me but the letters on the chips don't quite support it. Plus the date of the Casino de Puerto Rico and chips coincide. I think that is a very big clue.
BTW, I clearly remember the name Caomo. I'm not sure it was called Casino de