McVitie Weston valve collection, National Union valve, type 371B
- Made:
- 1949
National Union valve, type 371B, marked CV3511, pinch marked 1658, (RMW/Y286 - McVitie Weston number), by National Union Radio Corporation.-1949
National Union valve, type 371B, marked CV3511, pinch marked 1658, (RMW/Y286 - McVitie Weston number), by National Union Radio Corporation.-1949