Although our store sells mostly British Militaria Collectables, technically, a military collectable is any piece of gear from anywhere in the world that may have been issued to or purchased by military personnel from the American Revolution through World War II.
Generally, the older and scarcer the item is, the more valuable, even fundamental World War I and World War II items are going up in value each day. One thinks of guns, pistols, swords, uniforms, spurs, cartridge boxes and belts, knives, bayonets, ammunition, belt buckles, musical instruments, buttons, flags, letters, pictures, medals, all of which may have presentations or attributions.
You may have a single military item, or better, a grouping (several related items such as a pistol and holster) from one individual. Ignorance of the rising value of military collectibles and deterioration from neglect are now the enemy. (Do not attempt to clean any item until it is appraised; proof of authenticity can be lost.)