From Brown:

Thomas King traded as T&H King from 1933 to 1938 at 14 New Buildings, Birmingham; at 12 New Buildings from 1939 to 1941; from 13/14 New Buildings in 1942; from 2 Lower Loveday Street from 1943 to 1951 and from 56 Summer Row from 1952 until 1959. It is thought the H in the name is that of Harold King, who at one stage was Manager of the Midland Gun Co. He worked under his own name from 1964 until 1978.

See also this thread: http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=294413

Tim