| Friedl Expert Committee, (Prüferkommission) |
Attest |
Scott |
20 a |
| MEPSI, Mexico Elmhurst Philatelic Society Inter (Prüferkommission) |
Attest |
Scott |
20 a |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
20 b |
| CEM, Comision de Expertos de Madrid (Prüferkommission) |
Attest |
Edifil |
20 C |
| Indian States Expertizing Service Inc., (ISES) (Prüferkommission) |
Attest |
Stanley Gibbons |
20 d var |
| Friedl Expert Committee, (Prüferkommission) |
Attest |
Michel |
20 H |
| Exfima, Comision de expertos (Prüferkommission) |
Attest |
Edifil |
20 J |
| CEM, Comision de Expertos de Madrid (Prüferkommission) |
Attest |
Edifil |
20 K |
