McVitie Weston valve collection, Neon Indicator Lamp valve
Neon Indicator Lamp valve, small glass bulb with S.B. cap, (RMW/K9 - McVitie Weston number), by Unknown maker.
Neon Indicator Lamp valve, small glass bulb with S.B. cap, (RMW/K9 - McVitie Weston number), by Unknown maker.