The house was owned by a German Family who lived there during WWI. The implication was that this system might have been used for spy communications, but I have no proof that this was the case. Please look at the photographs of the entire system and then each individual component that is mounted on the board. This unit was put on the air by the original owner and the signal was received in the Atlanta, GA area using 40 meters.My carrier based CW signal was not received using the crystal detector. I can relate this story because the original owner is now a silent key. I do not know, but I suspect that it does, given that it has been in a climate controlled room since acquisition, but consider it not tested. It shows in the display area well. I want this unit to arrive at your location in good condition. If more I will pay the difference. The item "Vintage Antique Spark Transmitter and Receiver On A Board. Antique Amateur Radio" is in sale since Tuesday, May 29, 2018. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Other Ham Radio Equipment". The seller is "k4mog" and is located in Powder Springs, Georgia. This item can be shipped to United States.