McVitie Weston valve collection, BTH Mazda valve, type P.215
BTH Mazda valve, type P.215, (RMW/C146A - McVitie Weston number), by British Thomson-Houston Company Limited.
BTH Mazda valve, type P.215, (RMW/C146A - McVitie Weston number), by British Thomson-Houston Company Limited.