| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
93 |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Scott |
93 |
| Vincent Graves Greene, Philatelic Research Foundation (Prüferkommission) |
Attest |
Scott |
936 a |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
95 L 1 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
96 L 3 |
| Weiss Expertizing International, . (Sonstiges) |
Attest |
Scott |
97 |
| Karaivanoff, Vassil Petkov (Sonstiges) |
Attest |
Scott |
97 a |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
A 1 |
