McVitie Weston valve collection, Mazda valve, type ARTP.1
Mazda valve, type ARTP.1, marked ZA.7077, silver metallized, (RMW/Y541A - McVitie Weston number), by British Thomson-Houston Company Limited.
Mazda valve, type ARTP.1, marked ZA.7077, silver metallized, (RMW/Y541A - McVitie Weston number), by British Thomson-Houston Company Limited.