Up for sale are 4pcs of vintage Valvo ZM1000 and 1pcs of ZM1001 nixie tubes. These tubes are fully functional and have been tested for proper operation. They are ideal for vintage electronics enthusiasts or collectors. The Valvo brand is known for producing quality electronics and these tubes are no exception. The ZM1000 and ZM1001 tubes are compatible with a variety of vintage electronic devices. Don't miss out on the opportunity to own a piece of electronics history.