McVitie Weston valve collection, valve
Valve, spherical glass envelope 1.7in diam, with top pip, on std American base type 009, (RMW/P56 - McVitie Weston number), by Unknown maker.
Valve, spherical glass envelope 1.7in diam, with top pip, on std American base type 009, (RMW/P56 - McVitie Weston number), by Unknown maker.