Nominally .50 caliber, .85 at muzzle. 8.25" octagon to round wedge retained barrel with baluster turned transition. NSN. Brass barrel, steel lock, brass furniture, hardwood stock. Single shot flintlock smooth bore cannon muzzle pistol with spring deployed bayonet. 3.75" flat, stepped and bolted flint lock marked TWIGG. Lock remains in original flint with a rounded and fenced waterproof iron pan with roller frizzen. Swan neck cock lightly engraved. Barrel with post-1813 Birmingham commercial proof marks and an indistinct tombstone shaped maker's mark. Top of barrel marked --LONDON--. Equipped with a 7" snap bayonet with a 5.5" triangular blade, with the release mounted on the breech plug tang. Includes an old horn tipped wooden ramrod that is too short to be functional, and is likely an old replacement. As the famous John Twigg of London died in 1790, this gun was likely made in the 1830s or 1840s by Edward Twigg of Birmingham, thus explaining the post-1813 Birmingham proof marks. It was not uncommon for Birmingham makers to mark their guns "London" to imply a higher level of quality and many makers often traded on the fact they shared a surname with more famous gunmaker.