| 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 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 6 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 6 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
C 6 |
