| Deutsches Institut, für internationale Philatelie (Prüferkommission) |
Attest |
Michel |
1 b |
| Experts, Philatelic (PE) (Prüferkommission) |
Attest |
Michel |
1 b |
| Experts, Philatelic (PE) (Prüferkommission) |
Attest |
Michel |
1 b |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
1 b |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Michel |
1 c |
| Raybaudi, Experts (Prüferkommission) |
Attest |
Sassone |
1 f - 4 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Michel |
1 I - 5 I; 7 I; 9 I |
| BPA, The British Philatelic Association Limit (Prüferkommission) |
Attest |
Michel |
1 II |
