NSN, circa 140's-1850's, right barrel is 16 ga. and left barrel is approximately .60 caliber, 30" round barrels. The Jacobs Rifle became known for accuracy at long distance. Approximately 900 were issued to officers and men. After General Jacobs death in 1858, many of the rifles were returned to military storage and later sold on the commercial market. Other English makers made their own variation of the Jacob’s Rifle for the commercial market. This rifle by Swinburne, the original contractor has commercial alterations such as a rifle barrel on left and smooth bore barrel on the right. The rifle, now a combination shotgun / rifle, has a 3-folding leaf rear sight. Bannerman in New York City sold these as “Elephant Rifles” in 1907. The patch box correctly marked “Jacobs Rifles”. (DALLAS LOCATION)