McVitie Weston valve collection, Osram-GEC valve, type T.3
Osram-GEC valve, type T.3, marked 5232 T.3 S/N 2316, (RMW/J75 – McVitie Weston number), by Osram-General Electric Company
Osram-GEC valve, type T.3, marked 5232 T.3 S/N 2316, (RMW/J75 – McVitie Weston number), by Osram-General Electric Company