These revolvers and their ammunition were designed by Daniel Moore and David Williamson as a work around for the Rollin White patent held by Smith & Wesson that prevented other companies from legally manufacturing revolvers with bored through cylinders. These revolvers were manufactured from 1864 to 1870 by Moore's Patent Firearms Co. and National Arms Co. It has etched scrollwork on the barrel along with a blade front sight and "NATIONAL ARMS Co. BROOKLYN, NY" marked on top, leafy scroll work etched on the cylinder which is also marked with the Williamson patent on the rear edge, intricate scroll and burst engraving patterns with textured backgrounds on the frame, entirely silver plated, gilt finish over the silver on the cylinder and frame, and smooth grips. The grips are marked "HC 73" on the back, and the same is stamped on the left side of the grip frame and back of the cylinder. The full serial number is on the bottom of the barrel.

Excellent overall, retains 95% original silver plating with 85% of original gilding on the frame and cylinder, and some spots of exposed brass. The barrel shows some spotting and mainly attractive aged patina. There are some minor takedown marks, and the grips are smooth overall with strong painted finish and minor dings. Mechanically functions, but does not rotate cylinder.