| Bach, Jean-Paul, und Eichele, Martin (BPB (Briefmarkenprüfstelle Basel)) |
Attest |
Stanley Gibbons |
23 |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
23 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
23 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
23 |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
23 |
| Sismondo, Sergio (Sonstiges) |
Attest |
Stanley Gibbons |
23 |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
23 |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
23 |
