McVitie Weston valve collection, Schott valve, type M
- Made:
- circa 1918
- maker:
- A Schott and Company
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Schott valve, type M, cylindrical glass envelope, bright copper anode, 4-pin base and top filament connection, anode marked M 4197 1.2 Amp, (RMW/J5 - McVitie Weston number), by Schott & Company, A., c. 1918.
