.56 caliber. 36" pinned three-stage octagon to round barrel. SN: NSN. Oxidized metal, brass and iron furniture, full-length walnut stock. Percussion altered flint lock marked with the American "{Spread-Winged Eagle}" motif forward of the hammer, and marked in three lines at the tail of the lock "TRYON/PHILADELPHIA/1845". Top flat of barrel marked "TRYON PHILADA", breech with cryptic markings intended to appear like English proof marks and no doubt to deceive the recipient of the gun into believing it was of English origin. Lock appears to be a repurposed U.S. Model 1816 lock plate, re-profiled for use with this trade gun and possibly for use to make New England Militia Muskets as well. Drum conversion to percussion with drum bolster missing and rounded commercial percussion hammer with light floral engraving. In imitation of the typical Northwest Trade Gun form the gun has a three-screw serpent side plate, an oversized iron triggerguard, a rudimentary raised carved apron around the tang and a flat brass buttplate. A single corrugated brass pipe secures the wood ramrod. While the Northwest pattern guns were certainly made in large quantities during their period of use, most were of English or Belgian manufacture. American made guns that so closely follow the form are rather scarce and one by such a desirable Philadelphia maker is a real rarity. A very important, if well used example of a scarce American trade gun.