The GR-201 is a medium-sized top-view nixie tube made by the company Rodan-Okaya. It is an early version of the CD-11, which evolved over time – there are at least six variants, shown at the end of the gallery. Apart from the labelling, they vary by the shape of the anode grid and the support structures.
| Digit size | 19mm |
| Min current | 1.5mA |
| Max current | 3.5mA |
Here are some photographs of the tube from various angles, followed by a video of it in action. The datasheet is at the end.