These revolvers and their unusual ammunition were designed by Daniel Moore and David Williamson as a work around the Rollin White patent held by Smith & Wesson and were manufactured from around 1864 to 1870. Total production is estimated to be around 30,000, and many have engraving on the frames. Very few, however, have this quality of engraving or etched cylinder scenes. This revolver has engraving accents on the muzzle, breech, and lug of the barrel; blade front sight and "MOORE'S PATENT FIRE ARMS Co. BROOKLYN, NY." on top of the barrel, "1056" on the bottom of the barrel, patent marking on the right side under the extractor, an etched scene with detailed background depicting a man on horseback lancing a bull and the Williamson patent marking on the cylinder, intricate scroll engraving with punch dot backgrounds on the silver plated frame, varnished walnut grips stamped "56", and "X56" on the left side of the grip frame.