I have 7 different El Monte Club chips.
I got them from Joe Bennon and Mel Jung back in 1997, 1998, and 2001.
3 different molds. SqinCir, Di Sq, and 2SqDia.
All delivered in 1961.

Joe and Mel were both selling them as Eureka, CA but swore they were later used at the Mayfair Club, an illegal New York City club in the 1970's. No idea where that story came from and have never found any proof of that.

The guy that owned the El Monte Club also owned a cigar store in Eureka, CA.

I do not see a 10¢ SqinCir on the orders. I see 50¢, $2, and $4 SqinSq.