McVitie Weston valve collection, Mazda valve, type U.U.30/250
Mazda valve, type U.U.30/250, (RMW/A78 - McVitie Weston number), by British Thomson-Houston Company Limited.
Mazda valve, type U.U.30/250, (RMW/A78 - McVitie Weston number), by British Thomson-Houston Company Limited.