Hi Matthew:
Here is some detailed information on your $100 MGM token:

SSC#: Not Assigned Number - 24 Karat Gold Inlay / .999 Fine Silver
Casino: MGM Sands Casino
City: Las Vegas, NV
Denomination: $100
Design side: $100, First Edition, MGM Sands Gaming Token
Logo side: MGM Sands, Lion Logo
.999: Design inner, .999 Silver
Mintage: ?
Issued: 1988

CURRENT BOOK VALUE: $250 - $300
(todays maket - fair asking price would be $175 - $200

Hope that helps,
Al Varelas / USMC
SS-1654

MY EBAY STORE:
https://www.ebay.com/str/usmc1965