“a Gun, fit for service, a Cartouch Box, and a Sword, Cutlass, or Hanger, and at least Twelve Charges of Powder and Ball, or Swan Shot, and Six Spare Flints,”
"every soldier Shall be well provided with a well fixed gun or fuse, Sword or hatchet, Snapsack, Cartouche box,horn charger & flints". New Hampshire Militia Laws, Oct. 7, 1692.
"one good Musket, Fuzee or other Firelock, well fixed, a Cutlass, Bayonet or Tomahawk, a Cartouche Box filled with 12 or more Cartridges of Powder, 12 or more sizeable Bullets and 3 Good Flints." 1757.
Belt loops on the back.
The copper nail in the centre works like a button to secure the outer flap closure.
A cartridge box I made some time ago for militia use. Cartridges are a lot faster to reload.