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.