| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
50 a |
| NPC, National Philatelic Centre (Prüferkommission) |
Attest |
ACSC: Australien-Commonwealth-Spezialist-Katalog |
50 A; 54 |
| CEM, Comision de Expertos de Madrid (Prüferkommission) |
Attest |
Edifil |
51 |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
51 |
| MEPSI, Mexico Elmhurst Philatelic Society Inter (Prüferkommission) |
Attest |
Scott |
51 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
51 d |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
51 L 1 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
51,275 |
