Hi Don,
What you have there was not a collectable silver strike. It was a usable
slot token. They did a $1.00 - $10.00 and a $25.00 one. I have the 3 pc.
set put away somewhere.
The $1.00 and $10.00 tokens were a very light brass, and the $25.00
token was a bi-metal / very light brass ring and very thin silver coating
The mint mark OC was the minting company - Osbourne Coinage

The casino was called: San Felipe's Casino Hollywood in San Felipe, New Mexico
opened their doors ion November 12, 1995 and closed them December 4, 2017
It became the "Black Mesa Casino" ....

Hope the information helps you out,
Al Varelas / USMC
SS-1654