Original US Navy replacement sample powder tank T.A.C.U. Co. 1945. Fairly good condition with some wear.
The Mark I designation indicates it was made for the Navy. The Navy kept samples of the powder exposed to the same heat, humidity, and motion as the powder loaded in the cartridges. This would be checked periodically to make sure the powder was not deteriorating in potentially dangerous ways. They had powder sample tanks in many of the magazines on ships, especially larger ships like cruisers or battleships that still used bag type charges instead of brass cases.
