McVitie Weston valve collection, Brimar valve, type 5Z4GT
Brimar valve, type 5Z4GT, cylindrical envelope, (RMW/Y358 - McVitie Weston number), by Standard Telephones and Cables Limited.
Brimar valve, type 5Z4GT, cylindrical envelope, (RMW/Y358 - McVitie Weston number), by Standard Telephones and Cables Limited.