Rare 1923 Martian Big 4 Crystal Radio Coil Receiver. This is what i know. Two balk Slide vertically on springs to tune the coil.
Detector arm is unique and swivels. Six lever binding post are on the bottom and two are on the top. Legs are nickel plated brass. This radio would originally accommodate up to four head sets, hence the name Martian Big 4.Condition appears to be good but is actually unknown due to unable to make sure it works. Nonetheless less this is a unique and rare device and would enhance any radio collection. I have added all the info i know and welcome advice and questions. The pictures tell the real story, please examine carefully. The item "Rare 1923 Martian Big 4 Crystal Radio Coil Receiver" is in sale since Sunday, November 14, 2021. This item is in the category "Collectibles\Radio, Phonograph, TV, Phone\Radios\Crystal Radios". The seller is "bitsandpieces1957" and is located in Sardinia, Ohio. This item can be shipped to United States.