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Early US Navy CG-1787. Only version seen with vertical ink markings on the base cap.
Thanks to Joe Gruber for sending the images.
The balloon envelope is 35 mm in diameter and, excluding the UV base pins, is 101 mm tall.
Reference: Joe Gruber. Type CG-1787 was first introduced in 1918.


Updated March 07, 2020.
shape:balloon construction:pinch type:triode age:1920.1930 base:uv pins:4 pin:
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