I have 5 different varieties. The two whites are clearly different colors. I have a number of each and the color differentiation is consistent. In addition, I believe one has rounded edges and the other are squared. The two yellows are also repeated consistently. There are no color gradients. I don't remember the measurements. I will try to find them and send them to you. I don't really collect old poker chips, though. Would you trade for casino chips?

Michael Siskin