The GR10J numicator from Hivac is a large nixie tube. It features the gold-colored anode that is common to Hivac tubes. To my eyes, this seems to be a chromate conversion coating.

Digit size 30mm
Min current 1mA
Max current 4mA

Following is a video, some photos of an unlit tube and a lit tube. The datasheet is at the end.


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