Vintage tin, NAA Galena crystal container.
The tin is empty, no crystals, but it’s pretty spiffy, I am tempted to use it as a ring box.
Made by the Newman-Stern Co., Cleveland, Ohio "Arlington Tested" Famous the world over for it’s supersensitive qualities.
The square container is metal and is about 1 & 1/4" square x 1" high. It is in good, vintage condition, as pictured.
The 1920's radio experimenter was always trying to improve his reception by trying different crystals.