| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) |
Attest |
Scott |
C 6 |
| Rossica, The Society of Russan Philately (Prüferkommission) |
Attest |
Scott |
C 68 b |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 7 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 8 |
| Friedl Expert Committee, (Prüferkommission) |
Attest |
Scott |
C 8 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C 9 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
C2 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
CC 1 |
