| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
18 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
18 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
18 |
| Raybaudi, Experts (Prüferkommission) |
Attest |
Sassone |
18 |
| MEPSI, Mexico Elmhurst Philatelic Society Inter (Prüferkommission) |
Attest |
Scott |
18 a |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
18 a |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
18 a |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
18 a |
