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This is a mystery but it looks much like the RD12Ta UHF triode. However, no grid winding is visible, suggesting that it could be a diode. Also the Triode is 32 mm in diameter and this is 8 mm wider.
It was made by Lorenz in Germany and the plastic knob suggests a military valve designed for rapid replacement in the field.
Comparing the knob dimensions with other easy replaceable valves indicates that the envelope is 40 mm in diameter - the same as other valves of the time.
In this image the white insulation on the heater can be seen as it enters the cathode tube.
The Lorenz name on the special five pin base.
Thanks to Oлer for sending these pictures.
The wide glass tube envelope is 40 mm in diameter, and excluding the base pins is 40 mm tall.
References: Observation. Type RD12Ta was first introduced in 1939. See also 1939 adverts.


Updated August 12, 2021.
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