Thanks again. What I meant to say in my previous post was that I think the smooth surface blue chip is the Burt chip ordered in 1952, the only color ordered at that time. And perhaps the blue chip with hatching was in the 1950 order along with a red hatch surface chip, thinking that all of the chips in the 1950 order would have the hatching. Not sure, maybe I'm making too much of this. Here's all three examples for comparison.