Brown Bros. Mach. Co.
St. Louis, Missouri, USA
According to N6TT, "[Brown Brothers] keys were made by one man, Bill Brown. Bill made the die-cast machine and all the key parts and dies himself. He also designed, painted and labeled each key ever made by the BBMC. Bill worked alone making the keys in his basement shop. He was a real craftsman and a true perfectionist."
(Click on the pictures to see larger images.)
Brown Bros. BTL-A
Brown Bros. Model ST