I guess that is why I am asking, I have several chips not in the book and I don't want to assume they are USPC co. However, Most of the chips have been in my family for 75 plus years, my grndfather worked at USPC co, and brought these home a few at a time for his kids (my mom and aunt) to play with. He would have no reason to buy any other chips as he was getting (taking?) these for free. They lived through the depression and were not going to buy chips when they had several hundred already. I don't know, did he or others pick up cheap, non USPC co chips elsewhere and we just assumed they came from work? Were there other chip makers in Cinti. that were making clay die cuts? Mom always said her dad brought these all from work.

its a mystery
bob