McVitie Weston valve collection
- Made:
- 1927 in United States and Canada
- maker:
- Mullard Limited
Mullard valve, type PM5B, marked A277, (RMW/D51 - McVitie Weston number), by Mullard Limited, 1927.
Mullard valve, type PM5B, marked A277, (RMW/D51 - McVitie Weston number), by Mullard Limited, 1927.