This crystal radio (detector) and headset are both American-made and have unique historical value. Both items have past the century mark. These items have been in my display cabinet for some 50 years and have been great conversation pieces. The crystal radio and headset are both American-made and have a unique historical value. This set would make a great addition to any collection or as a display piece. Joy-Kelsey Corporation Crystal Detector (1922). Joy-Kelsey Corporation Crystal radio in beautiful wooden box with a black top panel marked J. Made by the Joy-Kelsey Corp. Well known for producing high-quality radio parts during the early 1900s It is identical to radios branded Jewel, Serenado and Victor, all were marked J. Superior Matched Tone Headset. These Headsets were manufactured between 1919 and 1924 and a popular accessory for radio enthusiasts during that time period.