| NPC, National Philatelic Centre (Prüferkommission) |
Attest |
ACSC: Australien-Commonwealth-Spezialist-Katalog |
11 D |
| Society of Philatelic Americans, S.P.A. (Prüferkommission) |
Attest |
Scott |
11 e |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
11 e |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Michel |
11 II a |
| The Philatelic Foundation, (Prüferkommission) |
Sonstiges |
Scott |
11 X 5 |
| Raybaudi, Experts (Prüferkommission) |
Attest |
Sassone |
11; 5; 9 a |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
110 a |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
110 b |
