Lancaster was a second generation London Gunsmith who made a number of contributions to the design of armaments, including systems for muzzle loading rifled cannons and his signature Lancaster Pistol, a monstrous quad-barreled firearm and logical evolution of the Howdah design. The mechanism from the Lancaster Pistol has been put to work in this arm, in a significant deviation from the single and double barrel breechloaders of the day; departing from the conventional wisdom of using the opening barrel as a lever for recocking an internal hammer or striker assembly, the Lancaster uses a double action internal hammer with rotating striker and four fixed inertial firing pins, with each pull of the trigger cocking the hammer and rotating the striker to line up with the next pin, discharging each barrel in a rotary sequence. The barrels themselves are arranged in a "square" configuration, two up and two down, with a single nickel sight bead in the concave top rib, which is lightly engraved at the breech and bears the legend "CHARLES LANCASTER 151 NEW BOND STt LONDON PATENT FOUR BARREL BREECH LOADING HAMMERLESS GUN". Each chamber is marked with a London "GP" and "V" proof along with the number "16". 2 3/4 inch chambers and a single extractor. The frame is engraved with "rope" pattern borders and floral screws, with "CHARLES LANCASTER'S PATENT/LONDON" on each side and a gold inlaid "SAFE" marking underneath the tang safety switch. The breech face bears another Lancaster Patent marking, with the individual recoil shields and pin bushings punch dot numbered to match, starting at the upper left barrel and running counter-clockwise (as viewed from the front). The stock is sharply checkered straight wrist walnut, with diamond profiles and lightly engraved hardware on the splinter forearm, a golden inscription oval engraved with a crest of a dragon head over a banner reading "MENS FORTIS IN ARDUIS" (The Mind is Strong in Adversity) and a leather covered recoil pad. The symbol has not been positively identified. Length of pull is 15 inches, drop at comb is 1 9/16 inches, drop at heel is 2 5/16 inches. Bores measure .772 (right over) and .773 (left over), .773 (right under) and .772 (left under), the wall thickness is .025 (right over) and .026 (left over), .022 (right under) and .026 (left under), the bore constriction is .000 (right over) (Cyl) and .004 (left over) (Skt), .004 (right under) (Skt) and .005 (left under) (Skt). The shotgun weighs 8.65 lbs., a light weight for a four barrel shotgun. Included with the shotgun is a brown leather covered case, with brass corner reinforcement, the trade label of Charles Lancaster inside the lid, 4 snap caps, a Lancaster marked solvent container, a carved bone small parts container, two ebony handled screwdrivers (one with Lancaster markings), a pack of bore cleaning patches, and a multi-piece cleaning rod.