McVitie Weston valve collection, Mullard valve, type SP4B
- Made:
- 1937
- maker:
- Mullard Limited
Mullard valve, type SP4B, gold metallized, (RMW/Y544B - McVitie Weston number), by Mullard Limited, 1937.
Mullard valve, type SP4B, gold metallized, (RMW/Y544B - McVitie Weston number), by Mullard Limited, 1937.