McVitie Weston valve collection, S.F.R. valve, type R27
- Made:
- 1923
S.F.R. valve, type R27, pinch marked 8237. carries a clipped retaining wire sealed ISTANBUL, (RMW/Y173 - McVitie Weston number), by Societe Francaise Radioelectrique, 1923.
S.F.R. valve, type R27, pinch marked 8237. carries a clipped retaining wire sealed ISTANBUL, (RMW/Y173 - McVitie Weston number), by Societe Francaise Radioelectrique, 1923.