Manufactured by Edward Gwyn and Abner Campbell of Hamilton, Ohio, c.1863-1864. The breech loading carbine has the Type II pivot-type lever latch, short lever, flat hammer with beveled edges and short base rear sight. A sling bar and ring are mounted on the left side of the receiver. The part octagon barrel has a military blue finish with wide base iron front sight and folding leaf rear sight. The rear sight, breech block, upper receiver tang and butt plate have a niter blue finish. The receiver, side plate, hammer, lever and lower tang are casehardened. The stock is oil finished black walnut. The lock plate is roll stamped "GWYN & CAMPBELL" in an arch above "PATENT/1862/HAMILTON.O." "UNION/RIFLE" is stamped vertically on the right side of the receiver. The serial number is stamped on the bottom of the receiver, underside of the barrel and the breechblock. Single letter Ordnance inspection marks are stamped on most components. The Ordnance Department final inspection mark which consists of the script initials "WHR" in a rectangle is stamped on the left side of the stock wrist. A small block letter "WHR" sub-inspection mark is stamped on the stock comb just ahead of the buttplate. Gwyn & Campbell manufactured approximately 4,000 Type II breech loading carbines in 1863 and 1864. These carbines were issued primarily to Federal cavalry regiments in the Army of the Cumberland and the Army of the Tennessee.