| 1950 | 1953 |
 |
 |
| Stempelbild | Stempelbild |
|
Stylised Owl |
Stylised Owl |
| 1954 | 1956 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1957 | 1958 |
 |
 |
| Stylised Owl |
| 1961 | 1961 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1969 | 1974 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1986 | 1987 |
 |
 |
| Stylised Owl | Stylised Owl |