McVitie Weston valve collection, Ediswan valve, type ES5 (H.F.)
Ediswan valve, type ES5 (H.F.), etched: High Frequency, (RMW/C94B - McVitie Weston number), by Royal Ediswan.
Ediswan valve, type ES5 (H.F.), etched: High Frequency, (RMW/C94B - McVitie Weston number), by Royal Ediswan.