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MT4_var

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ID = 19707
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Marconi's Wireless Telegraph Co. Ltd. 
Tube type:  Transmitting Triode, air cooled 
Identical to MT4_var
First year 1919 ?? British Radio Valves - The Vintage Years, Thrower page 129 but Ediswan before

Filament Direct
Description Ediswan is probably producing until 1919 when production went to Osram. 
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