Vintage JEWEL models 500, 501, 502, 503, 504 and 505 4 tube Superheterodyne AM radio receiver.  Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test charts, repair parts list and description. 4 pages. Dated 1947. Jewel Radio Corp., of New  York, NY. This manual would make a sensational accompaniment to your classic retro radio equipment.