McVitie Weston valve collection, 362 Radio Valve Co Ltd valve, type M.P.4.
362 Radio Valve Co Ltd valve, type M.P.4., ceramic 7-pin base, metallised, (RMW/H35 - McVitie Weston number), by 362 Radio Valve Company Limited.
362 Radio Valve Co Ltd valve, type M.P.4., ceramic 7-pin base, metallised, (RMW/H35 - McVitie Weston number), by 362 Radio Valve Company Limited.