McVitie Weston valve collection, Sylvania valve, type 78
Sylvania valve, type 78, pinch marked 34, (RMW/Y90 - McVitie Weston number), by Sylvania Electric Products Incorporated.
Sylvania valve, type 78, pinch marked 34, (RMW/Y90 - McVitie Weston number), by Sylvania Electric Products Incorporated.