NSN. Made circa 1800. Approximately 34 caliber with 2” screw off barrels. The metal has been cleaned and the barrels have a later blue that is fading into a gray patina. All of the markings and engraving remain sharp. This is an interesting gun that has two barrels that fire at once and a third barrel for the “second shot” The action works well, but the main spring is a little weak. The grip is vert fine. Very fine three barrel pocket pistol!