McVitie Weston valve collection, Brimar valve
Brimar valve, envelope marked 2J4, base marked 1, 11, 7, (RMW/Y211 - McVitie Weston number), by Standard Telephones and Cables Limited.
Brimar valve, envelope marked 2J4, base marked 1, 11, 7, (RMW/Y211 - McVitie Weston number), by Standard Telephones and Cables Limited.