This is a rare and historically significant WWII era Type CAY 47153A NAVY Aircraft Transmitter Radio Tuning Unit. This piece of military equipment, manufactured in the 1940s, served a crucial role in aircraft communication during the Second World War. Information Label: Type GAY-47151A Plug-in Tuning Unit. Frequency Range: 800 to 1500 KC. A Unit of Model GP-7 Aircraft Radio Equipment. Contract Date: June 27, 1940. There is a chart on the side that. Height: 8 ¾ inches. Comes as is, untested. See photos for more details. What is pictured is what you will receive! Any questions will be responded to as quickly as possible. Make this rare piece of aviation history part of your collection! And feel free to look at the rest of our listings as we preserve aviation and space flight history and technology. All proceeds from this sale benefits the San Diego Air & Space Museum, a private non-profit 501(3)c organization, to carry out its mission.