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ID = 53933
Great Britain (UK)
Brand: ETL Electronic Tubes Ltd., High Wycombe B'shire
Tube type:  Dekatron 
Identical to GC12/4B = CV5243

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament No heater
Description Bidirectional divide-by-12 counter with intermediate outputs. 4000 pps max counting speed. 
Dimensions (WHD)
incl. pins / tip
30 x 100 x mm / 1.18 x 3.94 x inch
Weight 43 g / 1.52 oz
Information source - - -   
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Aldo Canepa

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GC12/4B: extract Factory datasheet
Michael Watterson

GC12/4B: Electronic Tube Handbook ETL
Aldo Canepa

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