McVitie Weston valve collection, Ediswan valve, type B.12
Ediswan valve, type B.12, marked: approved sample, (RMW/C110 - McVitie Weston number), by Royal Ediswan.
Ediswan valve, type B.12, marked: approved sample, (RMW/C110 - McVitie Weston number), by Royal Ediswan.