| Princess | |||||
| Keller & Knaprich GmbH, Augsburg, Germany | |||||
| Models and s/n | Y | M | D | Remarks | Ref. |
| Portable | |||||
| Prinzess | |||||
| up to 7000 | 1951 | Production started in 1948 | 13 | ||
| 16000 | 1952 | 13 | |||
| 27000 | 1953 | 13 | |||
| 29000 | 1954 | Mar | 13 | ||
| Princess 200 | |||||
| over 30000 | 1954 | Apr | 13 | ||
| up to 40000 | 1954 | 13 |