McVitie Weston valve collection, Mazda valve, type PEN/DD/4020
- Made:
- circa 1937
Mazda valve, type PEN/DD/4020, Marked DUMMY, one pin clipped, pinch marked Pen/40/20/S, stem marked 224, (RMW/Y166 - McVitie Weston number), by British Thomson-Houston Company Limited, c. 1937.