From Robert Eisenstadt's excellent Chip Mold Project work:

http://www.antiquegamblingchips.com/molddesign_letters.htm

"H" MOLD (H.C.E.)-- 8 H's. H. C. Edwards and Co., NYC. Was a major supplier of Nevada chips, 1940's to 1968. The business was started in the 1920's [I own a 1929 H. C. Edwards catalog, but unfortunately it didn't include chips, just dice, cards, etc., although "checks" was one of the products listed on the cover] and was sold and broken up in 1984. Then Bazaar Supply/Berk Trading Co., Yonkers, NY, owned the mold and used it infrequently, but not for U.S. casinos. I am told that the mold was used in Europe at that time. In about 2004, Bazaar Supply/Berk Trading went out of business, and Atlantic Standard Molding/Poker Chips Online bought the mold, and although it is not yet shown on their web site, it is used today by ASM for home poker chip sets, but not for casinos..........Mark Lighterm has obtained some of the H C Edwards Co. shipping-chip hot-stamp records and has put them on two CD's ($15.00) and in an H.C.E. book. E-mail him at mlighter@bellsouth.net