McVitie Weston valve collection, Ediswan valve, type AR-3
Ediswan valve, type AR-3, serial no. 12553, filament broken, (RMW/C9 - McVitie Weston number), by Royal Ediswan.
Ediswan valve, type AR-3, serial no. 12553, filament broken, (RMW/C9 - McVitie Weston number), by Royal Ediswan.