Vintage ZENITH models K622, K622F, K622G and K622W (Ch. 6K03) 6 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.