| Vincent Graves Greene, Philatelic Research Foundation (Prüferkommission) |
Attest |
Scott |
130 a |
| Friedl Expert Committee, (Prüferkommission) |
Attest |
Scott |
1300 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
131 |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
131 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Yvert et Tellier |
131 |
| The Philatelic Foundation, (Prüferkommission) |
Sonstiges |
Scott |
132 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
132 |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
132 L |
