| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
C 14 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
C 15 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Scott |
C 17; C 23 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 19 |
| Robineau, J. (Sonstiges) |
Attest |
Scott |
C 2 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 23 c |
| Trachtenberg, Henri (AIEP (Association internationale des experts en philatélie)) |
Attest |
Scott |
C 3 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 3 |
