Produced between 1817 and 1820, later converted and then reconverted. Brass blade sight on the double barrel band, with "P/ US" and "OA" on the barrel (above touchhole) and faded maker marks on the lock plate. The letter "B" stamped on bottom of the flashpan and on the lockplate screws. Fitted with a detachable flash pan. Replacement ramrod. Smooth stock with iron fittings and butt cap.