Nice Chips.
BTW, the order records for the Portland Card Co (Portland, OR) who owned the CSQ mold and hot stamped those chips still exist, and summaries of those records are in the The Gaming Table (2017).
Your chips were sold to Chuck Colier, Oxford Bar and Billiards, 331 First Street, Haver, Montana, in 1976. He ordered just the four colors, which you have.
The chips were made by the Burt company. You can actually see that by looking at the sides of the chips, which are missing the brass filings. I believe that ASM was the first to use brass. Burt used other metals to add weight to their chips.