It's a half size mock-up of an infantry cartridge box of the napoleonic period, prabably made for a child's fancy dress or a display item.
Although it has the rough size of a shoulder pouch, it's construction has the rear strip for passing the crossbelt through, but is missing any iron buckles below for fastening them.
As a shoulder pouch it has no mountings for a belt to attach to the sides, which while they might be missing, makes it unusable.
It's construction method is neither one nor the other and appears to be a wooden frame with glued leather or heavily lacquered cloth, neither of which are a contemprary style till much later.
Cartridge boxes didn't have a badge on the flap at that date, and the pouchbox wouldn't have such a crude construction method.
Overall my impression is it's a victorian display piece or prop rather than being a military item as such