Cossor valve, type 41 MHL, red label, metallising marked June 1931, dud, (RMW/F42 - McVitie Weston number), by A C Cossor Limited, 1931.
Cossor valve, type 41 MHL, red label, metallising marked June 1931, dud, (RMW/F42 - McVitie Weston number), by A C Cossor Limited, 1931.