| Vincent Graves Greene, Philatelic Research Foundation (Prüferkommission) |
Attest |
Scott |
C 5 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 58 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
C 6 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 6 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
C 6 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 6 |
| Sismondo, Sergio (Sonstiges) |
Attest |
Scott |
C 68 |
| Rossica, The Society of Russan Philately (Prüferkommission) |
Attest |
Scott |
C 68 b |
