Tandy AM telephone Radio Custom Mfd. in Korea for Radio Shack A Division of Tandy Corporation. The speaker is in the earpiece. The switchhook is On-Off control. Rotatong mouthpiece controls the volume. Telephone dial doubles as radio tuning dial. Cat. No. 12-1921 From Gary's notes I beleive this is the radio shown in the book Collecting Transistor Novelty Radios A Value Guide by Robert F. Breed, page 187 Plate 489. Also the book, Novelty Radio Handbook by Debbie Weaver A Schiffer Book for Collecors With Price Guide page 49.