Cossor valve, type X.308, marked - Hard, three anodes, black moulded 8-pin base loose from glass envelope, (RMW/K44 - McVitie Weston number), by A C Cossor Limited, 1934.
Cossor valve, type X.308, marked - Hard, three anodes, black moulded 8-pin base loose from glass envelope, (RMW/K44 - McVitie Weston number), by A C Cossor Limited, 1934.