McVitie Weston valve collection, STC valve, type 4102D
STC valve, type 4102D, pinch marked D516, top pip broken, (RMW/E146 - McVitie Weston number), by Standard Telephones and Cables Limited.
STC valve, type 4102D, pinch marked D516, top pip broken, (RMW/E146 - McVitie Weston number), by Standard Telephones and Cables Limited.