Vintage MOTOROLA models 52C6,  52C7 and 52C8 (Ch. HS-310) 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 1952. This manual would make a sensational accompaniment to your classic radio equipment.