Hi James,
Here is a picture of the chip. It is better than trying to tell you what issue it is, etc.

Now let me see if I understand you correctly. When you wrote your book this piece was unique. However, since Christmas you have found five of them; one of which you put up on Ebay. Is this correct? I knew about the quantity of $5.00 & $25.00 you found coming from a different issue. Also the Baccarat were the ones listed on page 141 top picture - YOUR issue 15.
Best, Jim

P.S. Happy Easter. Your girlfriend is very nice. It was my pleasure meeting her at the Bottle Show.