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This exhibit is the Moorhead Special transmitting valve that was made for the US market. The internal gettering gives the glass a gold appearance.

Thanks to Joe Gruber for sending the images.

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

Reference: Joe Gruber. Type Moorhead-Special was first introduced in 1917. See also 1917 adverts.

Pin Connections