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ID = 57715
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Developer: Osram-Valves GB (not MO-Valves) 
Tube type:  Transmitting Triode, air cooled   Text 
  <1925 very rare. ***
Identical to B2_Osram

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Military and/or Government
Filament Vf 6 Volts / If 1.4 Ampere / Direct
Description First made April 1917. 50 watt transmitting tube, with 400 - 500 anode volts. Designed by the Osram Lamp Works in conjunction with The British Government Signals Establishment, Woolwich. 
Dimensions (WHD)
incl. pins / tip
55 x 115 x mm / 2.17 x 4.53 x inch
Information source British Radio Valves - The Vintage Years: 1904-1925   Page 70
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