| Eichele, Martin (BPB (Briefmarkenprüfstelle Basel)) |
Attest |
Stanley Gibbons |
1 var |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
1; 2; 6 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
1; 3 a |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
1; 4 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
1; 4 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Stanley Gibbons |
1; 4 a |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
10 |
| Moorhouse, Brian (Sonstiges) |
Attest |
Stanley Gibbons |
10 |
