| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
49 |
| Indian States Expertizing Service Inc., (ISES) (Prüferkommission) |
Attest |
Stanley Gibbons |
49 a |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
491 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
491 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Sonstiges |
Scott |
498 b |
| CEM, Comision de Expertos de Madrid (Prüferkommission) |
Attest |
Edifil |
5 |
| CEM, Comision de Expertos de Madrid (Prüferkommission) |
Attest |
Edifil |
5 |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
5 |
