| FNIP - Federation of, national and international stamp dealers (Prüferkommission) |
Attest |
COB / OBP / OCP |
2 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
2 |
| Indian States Expertizing Service Inc., (ISES) (Prüferkommission) |
Attest |
Stanley Gibbons |
2 |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
2 a |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
2 a |
| RPSVI, Royal Philatelic Society of Victoria Inc (Prüferkommission) |
Attest |
Stanley Gibbons |
2 a |
| Raybaudi, Experts (Prüferkommission) |
Attest |
Yvert et Tellier |
2 a |
| BPA, The British Philatelic Association Limit (Prüferkommission) |
Attest |
Michel |
2 a |
