| Eichele, Martin (BPB (Briefmarkenprüfstelle Basel)) |
Attest |
Stanley Gibbons |
27 a |
| Caffaz, Egidio (APFIP (Associazione Periti Filatelici Italiani Professioni.)) |
Attest |
Yvert et Tellier |
65 |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
96 |
| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
96 |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
D 5; D 5 a |
| Louis, Karl-Albert (BPP (Bund Philatelistischer Prüfer)) |
Attest |
Michel |
GB 17I; 19 IIb |
