E&G Higham, Liverpool, Lancashire. listed as active 1857 -1869.The Higham family of gunmakers also had business locations in Warrington, Lancashire, Oswestry, Shropshire, and Welshpool,in Wales. George G. Higham was listed at; 3 Bailey street, Oswestry, and in Church Street, Welshpool in 1887.
Your gun was proof tested in Birmingham, 1994 or later,because this is the date when the use of the Bar pressure measurements was introduced. The marks on your gun should indicate reproof.
Some records show that Higham was in business in Warrington as early as 1795.