You're right, Dennis. It appears the images in The Chip Guide have the wrong TCR number associated with all four colors. It probably should be N8555. The Harveys chips with pictorial hot-stamps are particularly hard to describe in words as TCR has to do.

It appears to me your blue chip is N7452 and it's not unusual for the old roulettes to take a while for all colors to become known. I'm hoping one of our roulette specialists, or maybe Harvey specialists, can help keep the hobby records up to date by showing their collection of this variety.

Thanks for showing the scan of your blue one!