Original U.S. Civil War type Armstrong Inert 12-Pounder Studded Shell Long Pattern Hand Select:Yes ) Some sources state that

) Some sources state that the tool has “three screwdrivers”

Markings do vary

a square central hole that allows the tool to be used as a wrench for turning the cleaning/charging rod while cleaning the bore or drawing a charge

Each segment is stamped "HOTCHKISS"

Original U.S. Civil War type Armstrong Inert 12-Pounder Studded Shell Long Pattern Hand Select:Yes ) Some sources state thatOriginal Item: The most advanced artillery in use during the American Civil War had rifled bores, which gave greatly increased range and accuracy. Since the war occurred just as rifling was being developed for artillery, a host of different rifling schemes were tried. Among the most famous and interesting was the British Armstrong studded shell, which was designed for muzzle loading cannon that had been modified by cutting three deep rifling grooves