Samuel Buckley served on the Birmingham Proof House Committee and in 1863 was one of the officers in the British Small Arms Co. He later establish a branch office in Detroit. Guns produced by William Powell in the 1860s exist marked Samuel Buckley & Co. Hammer guns and Anson & Deeley patent BLNEs were imported into the US by J. Palmer O'Neal of Pittsburg, PA in the 1880's.
See The Double Gun Journal Vol. 22 Issue 3, 2011

"The American Exporter’s Export Trade Directory" of 1915 listed Samuel Buckley & Co. as “chiefly importers” with offices at 16 East 33rd St., New York, 2 Soho Square, London and Liege, Belgium. Samuel Buckley & Co., Manhattan incorporated in July 1921.