McVitie Weston valve collection, Marconi-Osram valve, type D.E.7
- Made:
- 1924
- maker:
- M-O Valve Company Limited
Marconi-Osram valve, type D.E.7, marked L 1324, pinch marked 3990, (RMW/G5A - McVitie Weston number), by M-O Valve Co. Limited, 1924.
Marconi-Osram valve, type D.E.7, marked L 1324, pinch marked 3990, (RMW/G5A - McVitie Weston number), by M-O Valve Co. Limited, 1924.