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Early US Navy CG-1787. Brass base cap with horizontal ink lettering. Rainbow getter & gold tipped pins.

The original box with operating details. The dimensions are 57 mm square and 127 mm tall.

Thanks to Joe Gruber for sending the images.

The balloon envelope is 35 mm in diameter and, excluding the UV base pins, is 98 mm tall.

Reference: Joe Gruber. Type CG-1787 was first introduced in 1918. See also 1918 adverts.

Absolute Maximum Operating Conditions^¶