Vintage SYLVANIA models 543 and 593 (Ch. 1-602-2 and 1-602-3) 5 tube Superheterodyne AM radio receiver with electric clock. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list. 4 pages. Dated 1953. This manual would make a sensational accompaniment to your classic radio equipment.