| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
551 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
56 |
| Crowe, William T. (Sonstiges) |
Attest |
Scott |
581 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Sonstiges |
Scott |
594 |
| Crowe, William T. (Sonstiges) |
Attest |
Scott |
651 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
689 |
| The One Cent Franklin Plating Archive, Richard Doporto (Sonstiges) |
Attest |
Scott |
7 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
7 |
