These carbines were manufactured by Edward Gwyn and Abner C. Campbell in Ohio and are essentially updated versions of their prior Cosmopolitan carbines. They were issued in fairly large numbers to Union cavalry units operating in the Western Theater, including the 8th Iowa Cavalry, which received 2,007 Gwyn & Campbells in total and was mustered into service in Davenport, Iowa, just across the river from Rock Island Auction Company. This carbine was one of 3,500 total Type II's manufactured in 1864, when the 8th Iowa received 1,120 of them. This example has the standard Type II markings and features, and is equipped with the 600 yard rear sight.