Looks like a very nice half stock rifle.
The name is actually "Bruff, Brother & Seaver". "The New York State Firearms Trade" (Swinney & Rowe) lists them in N.Y. City 1856-58.
An ad in "Spirit of Times", Oct. 25, 1856 reads in part: "Bruff, Brother and Seaver/Importers and Manufacturers of Guns, Rifles, Pistols and Sporting Articles/44 Warren-Street, New York..."