Christy and Jones didn't make chips; they were made for Christy and Jones by the Burt Company using the THC mold that Christy and Jones designed and owned.
I don't know about monogrammed C&J THC chips specifically, but Burt Co chips were sold by a variety of distributors (each with their own set of molds) and were sold to both the cardroom/casino market and the home market, and this was in the decades prior to the rise of the Vegas casinos. You can find lots of monogrammed Burt Co chips on the market in various molds, usually solids but sometimes with simple spot patterns. Usually someone will turn up a case of them in grampa's attic and then sell them on Craigslist or Facebook or eBay, and one of the eagle-eyed PCF vultures will take note and either post about it in the forum or grab it themselves and resell it in the classifieds.