EXPERIMENTALPROTOTYPEPRE-SERIESAssembled DUNWOODY HIGH PERFORMANCE CRYSTAL RADIO SETUnique Handmade Crystal Radio Set in New Condition with instructions.Medium waves.The crystal radio set is built of highest quality materials and parts of new-old-stock Russian-made.100% tested and working.Very good construction and the best result.To operate this set, all one needs is a good antenna, ground and high-impedance headphones. Good packing and tracking number. If you have any questions... please feel free to ask. See my other lots!