This pistol is based on the A.A. Thorn patent like the four barrel version. Only around 233 of the two barrel pistols were made. These are further subdivided into different calibers and frame styles. This pistol has a German silver blade front sight on an integral solid rib, fixed groove/notch rear sight on the top of the action, "CHARLES LANCASTER, PATENT, 151, NEW BOND ST, LONDON." on top of the upper barrel, London proofs, and "476 CF" in the left side of the concave center rib. The face of the action has the Lancaster patent marking twice. The serial number is on the bottom of the trigger guard, "45" is on the bottom of the barrel group and frame, and the pistol is fitted with checkered walnut grips and a lanyard loop on the butt. It comes in a leather case with a Lancaster trade label, an ammo tin, a cleaning rod, and a brass lid escutcheon with a monogram consisting of the letters H, W, and I.