These chips exist. I was supposed to have one mailed to me back in the late 1990's.
Never got it and lost contact with sender. Ed Hertel might have one. If so maybe he will upload a scan. Doc, if you are reading this, I know you have the chip. Doc and I traded a lot of emails on these chips. There are other HN chips out there. The H in Herbs chips is a hair different than the others.

Herbert "The Cat" Noble was part of the Dallas Mafia and a sworn enemy of Benny Binion.
It took Benny 12 tries to kill "The Cat" including a couple of airplanes rigged with explosives.
There are several bios on the Dallas Mafia, on the net. Here is a good one if anyone is interested. Thanks Robert E.
http://books.google.com/books?id=uisEAAAAMBAJ&pg=PA139&lpg=PA139&dq=benny+binion+texas+dallas+ivy+miller&source=bl&ots=exTAefB4_S&sig=oE6cVfBkczf0QOKTK8okZ-2kniA&hl=en&ei=9yr3S97pEsH_lgeG8YHvCg&sa=X&oi=book_result&ct=result&resnum=2&ved=0CBcQ6AEwAQ#v=onepage&q=benny%20binion%20texas%20dallas%20ivy%20miller&f=false