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ID = 82801
Tube type:  Signal Diode - one single system   Detector 
Identical to Fleming_1889

Base Wires
Was used by Radio/TV-reception etc.
Filament Direct / Battery =

John Ambrose Fleming had the Edison Swan United Electric Company make him an experimental series of valves in 1889. THese were known as oscillation valves. Several types and sizes of a similar style were made. Filament voltage is unknown. Several of these are in the Science Museum in London and replicas have been made over the years.

Information source -- Collector info (Sammler)   
Fleming_1889: National Valve Museum UK
Fin Stewart


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