| Vincent Graves Greene, Philatelic Research Foundation (Prüferkommission) |
Sonstiges |
Scott |
3 |
| Sismondo, Sergio (Sonstiges) |
Sonstiges |
Scott |
3 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
3 |
| Moorhouse, Brian (Sonstiges) |
Attest |
Scott |
3 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
3 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
3 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
3 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
3 |
