| Brandon, David Expert Committee (Prüferkommission) |
Attest |
Stanley Gibbons |
A 1 a |
| The Philatelic Foundation, (Prüferkommission) |
Attest |
Stanley Gibbons |
A 10 |
| Friedl Expert Committee, (Prüferkommission) |
Attest |
Michel |
A 12 |
| Savez Filatelista, Jugoslavije (Prüferkommission) |
Attest |
Michel |
A 19; 20 I |
| Friedl Expert Committee, (Prüferkommission) |
Attest |
Stanley Gibbons |
A 2; A 2a; A2 b |
| GPS, Germany Philatelic Society (Prüferkommission) |
Attest |
Michel |
A I |
| APS, (American Philatelic Society) (Prüferkommission) |
Attest |
Yang |
AD67 |
| RPSL, Royal Philatelic Society (Prüferkommission) |
Attest |
Stanley Gibbons |
AS 44 |
