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ID = 42861
Brand: SFR (S.F.R.) - Société Française Radio-Électrique; Paris
Tube type:  Vacuum Pentode   Power/Output 
Identical to P17C
Similar Tubes
Other base and data slightly different:

Base Europe side contact P8A (Au P, 8SC) Top contact with a cap.
Filament Vf 6.3 Volts / If 1.45 Ampere / Indirect / Parallel, (AC/DC)

Class C Transmitting Pentode. f<15 MHz.

807 based tube with a P8A base.

The Brans radio-Tubes Vademecum 17th. edition 1961-63 gives 1.45A heather current but website "The National Valve Museum" gives 0.9A like a standard 807.

Information source Babani, International Radio Tube Encyclopaedia   
Brans, P.H. Radio Schema's, Antwerpen   17 th. edition 1961-63 p354
P17C: Ebay
Patrice Zeissloff

P17C: Brans Vademecum 1961-63
Patrice Zeissloff

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