McVitie Weston valve collection, Mazda valve, type S.215 VM.
Mazda valve, type S.215 VM., pinch marked SV/L224, (RMW/G81 - McVitie Weston number), by British Thomson-Houston Company Limited.
Mazda valve, type S.215 VM., pinch marked SV/L224, (RMW/G81 - McVitie Weston number), by British Thomson-Houston Company Limited.