| CEM, Comision de Expertos de Madrid (Prüferkommission) |
Attest |
Edifil |
20 K |
| Comex, (Prüferkommission) |
Attest |
Edifil |
20 L |
| Raybaudi, Experts (Prüferkommission) |
Attest |
Sassone |
20/I; 21/I |
| Friedl Expert Committee, (Prüferkommission) |
Attest |
Scott |
209 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
21 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
21 |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
21 |
| BPA, The British Philatelic Association Limit (Prüferkommission) |
Attest |
Stanley Gibbons |
21 |
