I bought this chip on eBay this week. It is very unusual. It is a John's Tahoe Nugget $500 NCV on one side (listed in Campiglia & Wells) and a Caesar's "Guide to Gaming" NCV on the other side. I am guessing that this was a chip used to test hot stamps. Tow questions: Are these pretty common? What the heck is a Caesar's "Guide to Gaming" chip - I could not find it in any of my books.