Action: Lever - Caliber: 38 WCF - Capacity: 10+1 - Grooves: 6 - Material: Wood/Brass/Steel - Finish: Blued - Barrel Length: 20 - Weight: 7.86 lbs. - Originally known as the Improved Henry due to its patented loading gate on the side of the frame designed by Nelson King Winchester's plant superintendent and the addition of a wood forearm the 1866 model was known as the Yellow Boy by the Native Americans because of its brass frame. The '66 model was the first true cowboy lever-action and the first that adapted well to carrying in a saddle scabbard due to its slab sided design. With over 170000 made between 1866-1898 it's popularity continued long after more powerful lever guns were introduced. The '66 model was famous worldwide with guns used by the forces of Benito Juarez in Mexico the Turkish army in their fight against the Russians and in the Wild West by such notables as Sioux Medicine Man Sitting Bull the Union Pacific's chief engineer General Grenville Dodge and desperado Bill Doolin.