HHL chips were made by the Burt company and I believe the mold was owned by Langworthy. During that time, all the distributors would hot stamp their own chips. I have to look at my files at work but I think it mainly in the early 50s. For Nevada, the HHL chips that I can think of are from the Nevada Club and the Horseshoe Club. Not sure about California Clubs, but when I usually see old monogrammed chips, I suspect they are more likely from illegal or underground clubs, then for personal use.