McVitie Weston valve collection, STC valve, type 4020A
- Made:
- circa 1932
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STC valve, type 4020A, marked G.P.O. W32 234, No. 73, pinch marked V 727, (RMW/E161 - McVitie Weston number), by Standard Telephones and Cables Limited, c. 1932.
