I had a complete sample set of those chips several years ago, I think the name of the design was Scarab., and they were sold on Trident Cards web site. I thought they were pretty cool, and ended up giving them away as prizes. I may still have the '0" chip (essentially NCV) and the dealer button (see below). The 1/4 chip replaced the .25 chip of most sets, and the set also included high denomination plaques.