| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Scott |
132 L |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
134 LU 3 VAR |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
143L5 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
152 L 1 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
153 L 1 |
| Fuller, Perry W. (Händlergarantien) |
Attest |
Scott |
2 XU 1 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
2 XU I |
| Baltimore Stamp, Company (Händlergarantien) |
Attest |
Scott |
2 XU I |
