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ID = 28658
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Universal 
Identical to RA_Mullard
First year 1923 ? 70 Years of Radiotubes and V.
First Source (s)
1921 : British Radio Valves - The Vintage Years, Thrower p.36
1923 : Saga of the Vacuumtube, Tyne page 378

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 4 Volts / If 0.7 Ampere / Direct / Battery =
Description R-type with spherical bulb. 
RA_Mullard: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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