Mullard valve, type 104V, glass envelope slightly loose, top half of anode gauze, (RMW/F44A - McVitie Weston number), by Mullard Limited, 1929.
Mullard valve, type 104V, glass envelope slightly loose, top half of anode gauze, (RMW/F44A - McVitie Weston number), by Mullard Limited, 1929.