| 1925 | 1926 | 1931 |
 |
 |
 |
| Stempelbild | ||
| Ull as in owl | Ull as in owl | Ull as in owl |
| 1931 | 1929 |
 |
 |
| Ull as in owl | Ull as in owl |
| 1930 | 1931 | 1932 |
 |
 |
 |
| Stylised Owl | Stylised Owl | Stylised Owl |
| 1932 | 1933 | 1934 |
 |
 |
 |
| Stempelbild | Stempelbild | |
| Ull as in owl | Stylised Owl | Stylised Owl |
| 1934 | 1936 | 1936 |
 |
 |
 |
| Stylised Owl | Ull as in owl | Ull as in owl |
| 1936 | 1937 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1961 | 1963 |
 |
 |
| Ull as in owl | Stylised Owl |
| 1965 |
 |
| Stylised Owl |
| 1999 | 1999 |
 |
 |
|
Stylised Owl |
Stylised Owl |
| 1999 | 1999 |
 |
 |
| Stylised Owl |
Stylised Owl |
| 1999 | 1999 |
 |
 |
| Stylised Owl |
Stylised Owl |
| 1999 | 1999 |
 |
 |
|
Stylised Owl |
Stylised Owl |
| 1999 | 1999 |
 |
 |
|
Stylised Owl |
Stylised Owl |
| 2003 | 2005 |
 |
 |
| Ull as in owl | Stylised Owl |