| Crowe, William T. (Sonstiges) |
Attest |
Scott |
137 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
1384 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Sonstiges |
Scott |
14 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Michel |
142 XB |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Michel |
142XB |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
150 |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
1578 b |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
162 |
