I scanned the insides of the casings closely when I had them disassembled for cleaning & stuffing with felt...nary a mark or word. They are the only casings I've ever come across that don't have mounting "studs" that penetrate the shell for mounting screws...and they were designed flush that way, they didn't break off. The quality of the construction (heavy casting, very good plating, hefty internal tension spring) had me wondering if they might have been Sonor or Premier, but the style & lines made me think Asian.
Jeff