1952 CV378 Cossor 53KU Rectifier Valve With A Brown Micanol Base Made in High Wycombe

This is an incredibly scarce 1952 CV378 Cossor 53KU Rectifier Valve With A Brown Micanol Base Made in High Wycombe

It is showing the characteristic balluster envelope, the parallelogram electrode cage and the swan neck getter plate.  A truly beautiful device with superb aesthetics and, more importantly, with a superb performance.