| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
55 |
| CEM, Comision de Expertos de Madrid (Prüferkommission) |
Attest |
Edifil |
55 |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
55 |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
55 c |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
55 L 3 |
| PSE, Professional Stamp Experts (Prüferkommission) |
Attest |
Scott |
551 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Michel |
559 K |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
56 |
