| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
370 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
370 |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
3895 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
39 |
| Weiss jr., William R. (Sonstiges) |
Attest |
Scott |
4 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Sonstiges |
Scott |
449 |
| Brettl, Maria (AIEP (Association internationale des experts en philatélie)) |
Attest |
Michel |
46 W I |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
491 |
