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This exhibit is a Moorhead Type VT A class II. The identification is the serial number on the base cap - 206896. It was made under contract for Marconi-DeForest and both names are on the base.

Thanks to Joe Gruber for sending the images.

The balloon envelope is 44 mm in diameter and, excluding the UV base pins, is 104 mm tall.

Reference: Joe Gruber. Type VT-A was first introduced in 1917. See also 1917 adverts.

Pin Connections