A used Mullard rectifier tube in good working order. It was made in the Dutch (Philips) Sittard factory.
Factory and date codes are KC0 / Y9J.
It has been tested on an Avo Mk3 Valve Tester and it tests very strong and balanced. For what it is worth, the needle on the meter reached the end stop. Because I realised it was going to, I took the photo early in order to prevent damage to the tester's moving coil meter.
10
