This is one of a group of 6 marbles, all the same style but different colors, where Drew added a 'P' to the signature for Premium. I think at the time in 1999 when he made these they were the best and cleanest he'd ever made so they received the special marking. Very cool slice of marble history, especially for Fritts collectors! These would be cool together in either a full or partial set if someone was so inclined.... Signed 'AF 1999 P'.