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ID = 28732
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to R7
First year 1920 Saga of the Vacuumtube, Tyne page 221

Base IS-1 (Interservice, UK 1918)
Was used by Military and/or Government
Filament Vf 3.7 Volts / If 0.48 Ampere / Direct / Battery =
Description British Navy version NR7 
Dimensions (WHD)
incl. pins / tip
x 81 x 35 mm / x 3.19 x 1.38 inch
Literature British Radio Valves - The Vintage Years, Thrower   Page 40
Saga of the Vacuumtube, Tyne   Page 221

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