| Hamilton-Bowen, Roy (BPP (Bund Philatelistischer Prüfer)) |
Attest |
Scott |
48 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
491 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
491 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Sonstiges |
Scott |
498 b |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
5 |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
5 |
| MEPSI, Mexico Elmhurst Philatelic Society Inter (Prüferkommission) |
Attest |
Scott |
5 |
| MEPSI, Mexico Elmhurst Philatelic Society Inter (Prüferkommission) |
Attest |
Scott |
5 |
