Bob,
You may also want to refer to "A Collector's Guide To Nevada Gaming Checks & Chips" by Howard and Kregg Herz, for additional listings and photos of casino chips having the "vintage" DISWRL mold. This book and "The Chip Rack" are a must for collectors such as yourself who are learning about the hobby.
JB

P.S. The chip is still listed should you wish to bid on it.