| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
5; 7 |
| MEPSI, Mexico Elmhurst Philatelic Society Inter (Prüferkommission) |
Attest |
Scott |
50 |
| Eichele, Martin (BPB (Briefmarkenprüfstelle Basel)) |
Attest |
Scott |
506 |
| MEPSI, Mexico Elmhurst Philatelic Society Inter (Prüferkommission) |
Attest |
Scott |
51 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
51 L 1 |
| Crowe, William T. (Sonstiges) |
Attest |
Scott |
526 |
| Raritan, Stamps Inc. (Sonstiges) |
Attest |
Scott |
53 |
| Vincent Graves Greene, Philatelic Research Foundation (Prüferkommission) |
Attest |
Scott |
537 i |
