.50 caliber. 41" wedge-retained octagonal barrel. SN: NSN. Browned finish, brass furniture, full-length stock with checkered wrist. Single screw commercial percussion lock is unmarked with some light engraving. Barrel with drum bolster signed "A+Gumpf" on top flat. Engraved Lancaster style four-piece brass patchbox with release in toe plate which is engraved en-suite, extended finger spur triggerguard, buttplate with faceted tang. Plain brass thimbles with baluster turned rings and entry pipe secure a wood ramrod with an iron button head tip. Mr. Ness' tag on the rifle notes that this is likely a US government contract trade gun and further notes that is a "fancy gun" and a "chief's grade" rifle that is "scarce". Andrew Gumpf worked in Lancaster, PA circa 1829-1848 and was one of nine Gumpfs that worked in the gunmaking trade for nearly 100 years in the region, from the late 1770s through the late 1870s.