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 example has the standard Type II markings and features. Equipped with a ladder rear sight graduated to 600 yards with a 700 yard notch, boxed script "WHR" inspection cartouche stamped on the left of the stock wrist and "R.K.W" inspection initials stamped ahead of the buttplate.