| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
23 |
| BPA, The British Philatelic Association Limit (Prüferkommission) |
Attest |
Stanley Gibbons |
23 a |
| Eichele, Martin (BPB (Briefmarkenprüfstelle Basel)) |
Attest |
Stanley Gibbons |
23 b |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
23; 31 |
| KGVI-Expertising, (Prüferkommission) |
Attest |
Stanley Gibbons |
230 da |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
235 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
236 a |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
24 |
