This is a wood and metal cut sheet film holder. It has compartments on either side that hold one sheet of film each. The compartments are separated by a flat-black painted metal divider. There there are two base flaps. Inserted into the top edge of the holder are two metal latches that swivel.
Along an outer edge: "FOLMER GRAFLEX CORP. | U.S.A.". On another edge: "3 1/2X4 1/2 GRAFLEX FILM PAT. OCT. 9, 1923".