| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
37 a |
| Indian States Expertizing Service Inc., (ISES) (Prüferkommission) |
Attest |
Stanley Gibbons |
37 B |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
370 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
370 |
| Friedl Expert Committee, (Prüferkommission) |
Attest |
Michel |
373 |
| BPA, The British Philatelic Association Limit (Prüferkommission) |
Attest |
Stanley Gibbons |
373 |
| ASOFILCA, Asociation Filatelica de Caracas (Prüferkommission) |
Attest |
ohne Angabe |
38 |
| MEPSI, Mexico Elmhurst Philatelic Society Inter (Prüferkommission) |
Attest |
Scott |
38 |
