| Ceremuga, Krzysztof (Sonstiges) |
Attest |
Stanley Gibbons |
D 1 |
| Ceremuga, Krzysztof (Sonstiges) |
Attest |
Stanley Gibbons |
D 1 |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
D 1 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Stanley Gibbons |
D 44 |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
D 5; D 5 a |
| Stanley Gibbons, Limited (Händlergarantien) |
Attest |
Stanley Gibbons |
D 62 c |
| BPA, Expertising Limited (Prüferkommission) |
Attest |
Stanley Gibbons |
D 6a |
| Hass, Charles F. (Sonstiges) |
Attest |
Stanley Gibbons |
D 76 b Essay |
