Manufactured by Swinburn & Son in 1859, this double barrel percussion rifle was invented by British Indian Army Brigadier General John Jacob for extreme accuracy and range using a special exploding conical bullet. An order of 900 of these rifles from Swinburn & Son were only issued to a special unit of Indian soldiers he raised named "the Jacob's Rifles" (he died before the rifles arrived) for a brief period and then were sold on the private market as sporting arms. A few of these rifles found their way to the United States and were used by at least a few marksmen in the Civil War while others were bought by Bannerman's and advertised as elephant rifles. "SWINBURN & SON/1859" marked locks, "JACOB'S RIFLES" marked patchbox door.