| FNIP - Federation of, national and international stamp dealers (Prüferkommission) |
Attest |
ohne Angabe |
E 26 - E 29 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
E 3 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
E 3 |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
E 5 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
E 6 b |
| Experts &, Consultants Limited (Prüferkommission) |
Attest |
Yang |
EC 307 |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Yang |
EC269 a |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Yang |
EC60 |
