| Vincent Graves Greene, Philatelic Research Foundation (Prüferkommission) |
Attest |
Scott |
C 3 c |
| Colomphil, (Prüferkommission) |
Attest |
Scott |
C 37 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Michel |
C 3b; c3 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 4 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 5 |
| Vincent Graves Greene, Philatelic Research Foundation (Prüferkommission) |
Attest |
Scott |
C 5 |
| Friedl Expert Committee, (Prüferkommission) |
Attest |
Scott |
C 5 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 58 |
