Please help me to identify this very old tube

I have the attached tube. It looks very old. There isn't any sign on it. It's a triode. The base looks UV. I think it's manufactured by Moorhead, but I'm not sure. Has anybody idea about it's manufacturer and/or type?

Best regards,

Otto

• IMG_20190109_211651_lowRes (78 KB)
• IMG_20190109_211727_LowRes (51 KB)
• IMG_20190109_211759_LowRes (49 KB)

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Hello Ottó

it seems to be an Electron Relay from de Forest or Marconi - Marconi has an rubber-stamped on base - like Your tube.

Foto is from : Saga of Vacuum Tube by Gerald F.J.Tyne

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Hello Hilmer,

Thank you for your effort. It looks the closest I have ever seen. 

Best regards,

Ottó

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