Vintage AIRLINE models GPL-3820A and GPL-3820B Tape Recorder. Original old Sams Photofact manual includes schematics, parts layout, exploded parts views, disassembly and adjustment instructions, troubleshooting, voltage & resistance test chart, repair parts list and description. 15 pages. Dated 3-1963.  Manufactured by Montgomery Ward & Company of Chicago, IL. This manual would make a sensational accompaniment to your retro audio equipment.