McVitie Weston valve collection, BTH Mazda valve, type H.L.607
BTH Mazda valve, type H.L.607, pinch marked W1, (RMW/C147 - McVitie Weston number), by British Thomson-Houston Company Limited.
BTH Mazda valve, type H.L.607, pinch marked W1, (RMW/C147 - McVitie Weston number), by British Thomson-Houston Company Limited.