This is an early model of the Puck with hinges on the same side as the film advance knob. The method of opening the camera is unusual, the back and one side are hinged to the rest of the body and open to give access to the spool holders. On later models the hinge is near the front of the camera and on the opposite side to the film advance knob. Similar cameras were sold by APM which were probably made by Thornton-Pickard.