| 1990 | 1991 | 1991 |
 |
 |
 |
| SG MS733a | SG 842 | SG 856 |
| Scott 554 | Scott 679b | Scott 680g |
| MS | MS | MS |
| Laughing Owl | Stylised Owl | Stylised Owl |
| 1991 |
 |
| Close Up |
| SG MS1098b |
| Scott 790 |
| Stylised Owl |
| 1996 | 1997 | 1997 | 1999 | 1999 |
 |
 |
 |
 |
 |
| SG BOB | SG BOB | SG BOB | SG BOB | SG BOB |
| Scott 1486d | Scott 1561c | Scott 1631a | Scott 1912c | Scott 2012c |
| MS | MS | MS | MS | MS |
| Cape Eagle Owl | Mottled Wood Owl | Great Horned Owl | Collared Scops Owl | Snowy Owl |
| 1999 |
 |
| SG BoB |
| Scott 1998 |
| Long Eared Owl |
| 2006 | 2006 | 2012 |
 |
 |
 |
| SG 2523 | SG 2529 | SG |
| Scott 2411a | Scott 2410 | Scott |
| MS | Sheet | |
| Pemba Scops Owl | Usambara Eagle Owl | Verreaux's Eagle Owl |
