I'm a newbee, but a wet chip collector and a cruise chip nut. The Spirit of London sailed for P&O in 1972-74. When P&O bought Princess Cruises in 1974,she was transferred to Princess where she became the Sun Princess. The pilot for the TV series "The Love Boat" was filmed on the Sun Princess. She sailed with Princess for 14 years before being sold to Premier Cruise Lines. There is also a $1 chip, sort of pink, that matches the 50c. I'll leave it to the experts to determine how this $ denomination chip appeared on a P&O ship