Around 8,200 of these "Grapevine Carbines" were manufactured in 1863 and 1864 by Edward Gwyn and Abner Campbell in Hamilton, Ohio. They were manufactured in the same factory as the Cosmopolitan carbines upon which they are based. This example has a blade front sight, notch and folding ladder rear sight, "GWYN & CAMPBELL/PATENT/1862/HAMILTON O" on the lock, "UNION RIFLE" on the right below the nipple, and government inspection markings, including a boxed "WHR" cartouche (inspector William H. Russell or Roberts) on the left side of the wrist. Many western/Midwestern mounted units were issued these carbines during the war.

Very fine with 85% plus original blue finish on the barrel (lightly fading), 60% of the bright original niter blue on the breech, and 75% plus of the original case colors on the remaining areas. There is some minor oxidation on the left side of the receiver, patches of pitting on top at the breech, and scattered marks and scratches throughout. The stock is also very fine and has some minor bruising and scratches. The markings, including the cartouche, are crisp.