Gwyn & Campbell manufactured around 8,200 of the Type I and Type II carbines in 1863 and 1864, and the carbines were primarily issued to a variety of Midwestern units during the Civil War. "UNION/RIFLE" marked on right of frame, lock marked "GWYN & CAMPBELL" in an arch over "PATENT/1862/HAMILTON. O", boxed script "RKW" and "WHR" inspection cartouches stamped on the left wrist, and small "R.K.W" inspection initials on top ahead of the buttplate tang. Matching visible serial numbers on the bottom of the barrel, frame, breech block and lever.

Excellent, retains 97% original blue finish on the barrel, 90% plus vivid original case colors remain on the frame, lock, hammer and lever, 75% plus fiery original niter blue finish on the breech block and upper tang, and 20% original niter blue finish on the buttplate with smooth brown patina on the balance. Stock is also excellent with attractive original raised grains and rich oil finish, defined edges, some scattered light handling marks, and exceptionally crisp cartouches. Mechanically excellent.