Today I exchanged some email with Jim Blanchard of Atlantic Standard Molding/Poker Chips Online, and he told me:
¶ the chip is an old one in his opinion.
¶ his company bought the H-Mold from Jordan Berk/Bazaar Supply (a gambling supply place in Yonkers NY, which owned the mold till they went out of business last year or so).
¶ Blanchard uses it for home poker sets, not casinos. He has not listed it on his web site yet.

Robert