.26 caliber. 3.62" tapered octagonal barrel. NSN. 3.5" single-edged spear point blade with prominent median ridge, 2.5" single-edged secondary blade. Gun metal barrel finish, German silver bolsters and furniture, iron hammer and trigger, horn grip with smooth side and checkered grip area. Single action single shot smoothbore combination percussion knife pistol with manually deployed folding trigger. Both knife ricassos marked UNWIN &/ROGERS/SHEFFIELD in three lines. Barrel with post-1813 Birmingham commercial proofs on the left angled flat. The gun metal bullet mold and steel tweezers are still present in the butt of the gun, and the butt trap door to store balls is functional. A nice example of the combination knife pistol concept that was popularized by Unwin & Rogers in the 1840s and 1850s that is not missing the often lost mold and tweezers. Philip Unwin and James Rogers worked in Sheffield, Yorkshire circa 1827-1868.