Dating from circa 1835, this spectacular side by side shotgun from the late flintlock era is recorded on page 109 of "The Mantons: Gunmakers" (Walker and Company edition, 1967) by W. Keith Neal and D.H.L. Back as a cased double barrel 13 bore shotgun credited to N. Blank, U.S.A. The browned Damascus barrels have a bead front sight, "John Manton & Son Dover Street" signed on the concave rib in ornate script, floral engraving that extends onto the patent breeches which have platinum liners, and London proofs on the bottom of the barrels. The matching serial number is marked on the bottom of the barrels and breech plugs, inside the forend, on the lower tang, and inside both locks. The locks each have the noted V-shaped frizzen and pan with the patent marking on the front of the frizzen, a frizzen spring roller, scroll engraving, a hare on the tail, and "John Manton & Son/PATENT" signed below the pan.