Abstract: A cassette for holding radiographic film in which the edges of the cassette are provided with identifying indicia in accordance with a preselected code. The cassette includes a rectangular front panel facing one side of the film and a removable back panel facing the opposite side. This latter panel is provided with a lead coating and a layer of felt on the surface adjacent the film. The back panel serves as a cover for the cassette and is held in place by a pair of leaf springs which are supported for pivotal movement intermediate their ends. A hollow rectangular frame is disposed about the periphery of the panels, and each edge of the frame includes an indentation in close proximity with but spaced from one of the adjacent corners of the frame. Each of the indentations carries coded identifying indicia mounted entirely within the indentation.