Do they have any denominations on them?
A possible answer, but no evidence....

S&S
Silver City Card Room
Cudahy, Ca

There is a listing on Staeffler's site, but no known images of chips. Cudahy is the 2nd smallest city in Los Angeles County (Hawiian Gardens is smallest) it was in the T.R. King area. It all makes sense😃 but that might be wishful thinking....it might be just a home set. Might nmed a few people with more info to chime in here. Very cool though!! I might be interested in a set??