McVitie Weston valve collection, Mazda valve, type PE7B
Mazda valve, type PE7B, marked 989, (RMW/P11 - McVitie Weston number), by British Thomson-Houston Company Limited.
Mazda valve, type PE7B, marked 989, (RMW/P11 - McVitie Weston number), by British Thomson-Houston Company Limited.