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Unknown

 
See also:
Catkin Valves - The Metal Valve - Osram Catkin Advert
    
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The catkin design dates to 1933 and 1934. This exhibit has no identification but is believed to be for battery operation.
The shaped anode has a flattened diamond cross section.
The thin metal envelope is 26 mm in diameter, and excluding the B5 base pins is 97 mm tall.
Reference: Observation.

 

Updated June 29, 2014.
shape:catkin construction:pinch type:triode age:1930.1940 base:b5 pins:5 pin:
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