| Holcombe, Peter (Sonstiges) |
Attest |
Yvert et Tellier |
3 B |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
37 |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
39 |
| Sismondo, Sergio (Sonstiges) |
Attest |
Stanley Gibbons |
40 |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Scott |
5 |
| The American Philatelic, Expertization Service (Prüferkommission) |
Attest |
Scott |
5a |
| American Board, of Experts (Prüferkommission) |
Attest |
Stanley Gibbons |
8 |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
8 |
