For sale is a rare GEC CV57 vacuum tube (1 piece). This is an original product made by GEC (General Electric Company) of the UK, a rare individual with the green oval GEC logo label remaining. It is a military specification (CV tube), with the markings "CV57" and "KB/Z". The appearance is very good, with high glass transparency, and there is no distortion or damage to the electrodes. *There are fine dirt and streak-like marks in the grooves of the silver getter surface, but there is almost no sign of use, and it is in a condition close to unused (NOS). Since actual use tests have not been performed, it is sold as is. Comes with the original box (VALVE ELECTRONIC label). *Although it is not a genuine GEC box, it is included for storage. A GEC-made CV57, which has become difficult to obtain in recent years. Ideal for collection, display, and research. ⸻ Notes *Operation has not been confirmed. *Please check the photos for the condition before purchasing. *Cancellations and returns are not accepted after purchase. *Please ask any questions BEFORE purchasing. Shipping *Shipping costs are to be paid by the buyer (cash on delivery). *Shipping will be done with a method that includes compensation and tracking. (Management number-cv57①)