Rare 1923 Martian Big 4 Crystal Radio Coil Receiver. Marked on top Martian Big 4, Newark, NJ. There are 6 connectors on the bottom (one is loose). It is also missing an insert on top where thumb screw is.The condition is good with nickel plating intact. Carefully examine photos for condition. The item "Rare 1923 Martian Big 4 Crystal Radio Coil Receiver" is in sale since Saturday, March 20, 2021. This item is in the category "Collectibles\Radio, Phonograph, TV, Phone\Radios\Crystal Radios". The seller is "jncollections32" and is located in Garfield, New Jersey. This item can be shipped to United States, Canada, United Kingdom, Denmark, Finland, Australia, Sweden, Belgium, France, Ireland, Netherlands, Italy, Germany, Austria, New Zealand, Switzerland, Norway, Bermuda, Iceland, Monaco.