| Name | London Name Plate MK.3 14A / 4200 Image Speed, Height, Ground Speed, Time Interval Computor |
| Front Scales | 1) 2) = 3) 4) |
| Back Scales | 5) = 6) 7) = 8) |
| Type of Rule | disc(s) |
| Material | metal |
| Dimension (mm) | 166x3 |
| Area of Use | aviation |
| Origin of Rule | Herman van Herwijnen |
| Match Number | 1691 |
| Comment | |
| Thumbnail |  |