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This exhibit is a VT Type A class II. Only a few VT's had the spherical envelope and it is not known why.

The original box.

The Moorhead used the Wallace Egg Company, who made egg crates, to design this shock absorbing carton.

Thanks to Joe Gruber for sending the images.

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

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

Pin Connections