McVitie Weston valve collection, National Union valve, type 36
National Union valve, type 36, pinch marked 86K6, (RMW/G107 - McVitie Weston number), by National Union Radio Corporation.
National Union valve, type 36, pinch marked 86K6, (RMW/G107 - McVitie Weston number), by National Union Radio Corporation.