The XN-13 numicator from Hivac is a regular size 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 15.5mm
Min current(guess) 1.5mA
Max current (guess) 3.5mA

Here are some photographs of the tube from various angles, followed by a video of it in action. Some additional information is at the end.

Compatible tubes: GN-13A

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