gunsaholic,The proof marks are Birmingham Black powder as found on guns made between 1887 and 1904.The gun is stamped 14 which indicates a 14G gun?Often seen on pinfire guns seldom on C.F. most unusual![Eley was producing some 14G shells at the time your gun was made.] The origional chamber length was likely 21/2 inch. The left barrel has some degree of choke.The right is cylinder.

Roy Hebbes