McVitie Weston valve collection, MOV/GEC valve, type V.R.12.B
MOV/GEC valve, type V.R.12.B, serial no. 5000-5144, filament broken, (RMW/C13 - McVitie Weston number), by M-O Valve Co. Limited; General Electric Company Limited.
MOV/GEC valve, type V.R.12.B, serial no. 5000-5144, filament broken, (RMW/C13 - McVitie Weston number), by M-O Valve Co. Limited; General Electric Company Limited.