McVitie Weston valve collection, BTH Mazda valve, type H.F.210
BTH Mazda valve, type H.F.210, (RMW/C142 - McVitie Weston number), by British Thomson-Houston Company Limited.
BTH Mazda valve, type H.F.210, (RMW/C142 - McVitie Weston number), by British Thomson-Houston Company Limited.