This version of the GN-4 has a red-coating and a decimal point on the left and was manufactured by Lorenz SEL. Like many nixie tubes, it uses a B13B socket. The digit height of 16.5mm is noticeable larger than the plug-compatible ZM1020 and other similar tubes.
| Digit size | 16.5mm |
| Min current | 1.5mA |
| Max current | 3.5mA |
| Base | B13B |