McVitie Weston valve collection, Mazda valve, type AC/S2
Mazda valve, type AC/S2, pinch marked Q 150/2, (RMW/G78B - McVitie Weston number), by British Thomson-Houston Company Limited.
Mazda valve, type AC/S2, pinch marked Q 150/2, (RMW/G78B - McVitie Weston number), by British Thomson-Houston Company Limited.