Rich;

I can not get your picture to display but I will assume you
are referencing "Agua Caliente" which was a Casino in Tijuana
BC Mexico, just south of San Diego. They had and still have a
race track at the same site. The Casino was said to be running
1928-1935 or so. Chips from it appear on EBay from time to time.
The chips have the initials "AC" on them.
I have in my collection a 1966 $1 token (metal) "Caliente" that
appears to have been used at the race track.

I hope that supplies a little info.

Jim