| Friedl Expert Committee, (Prüferkommission) |
Attest |
Scott |
15 |
| Vincent Graves Greene, Philatelic Research Foundation (Prüferkommission) |
Attest |
Scott |
15 |
| Odenweller, Robert P. (AIEP (Association internationale des experts en philatélie)) |
Attest |
Scott |
15 f |
| MEPSI, Mexico Elmhurst Philatelic Society Inter (Prüferkommission) |
Attest |
Scott |
15; 17 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
150 |
| Alvarez, Ricardo (AIEP (Association internationale des experts en philatélie)) |
Attest |
Scott |
151 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
152 L 1 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
153 L 1 |
