I believe this to be a barrel/cylinder for a Smith & Wesson #3 1880 Frontier model. I measure the barrel at 5" and the cylinder length is 1.562" inch which is 1 9/16. The chambers are for 44/40 and it is a 6 shot cylinder. The bore has a few black powder pits but is in surprisingly good condition for its age.The item "Antique S&W Model #3 DA barrel & 44/40 cylinder" is in sale since Tuesday, January 09, 2018. This item is in the category "Sporting Goods\Hunting\Vintage Hunting\Vintage Gun Parts". The seller is "6mm1" and is located in Midlothian, Virginia. This item can be shipped to United States.