It was really buying a pig in a poke. I couldn't quite make out what it was. My biggest fear was that it was a regular chip altered by someone.

I have three chips with the inlaid white ring. A fourth, the buffalo head, was shown in Allan Myers article on C&S. My three chips and a pic of the fourth from Allan's article is below.

Besides the Tango, I only have info on the BH. I bought the chip from the widow of a big time gambler a the Beverly Hills Super Club. She found in in a box her husband kept of BH memorabilia. The woman - no clue

I would think all 4 chips were custom made by USPC. I assume for a fee the company would make whatever you wanted. There must be more of these out there