| Prüfer | Art der Urkunde | Katalog | KatalogNr. |
|---|
| APS, (American Philatelic Society) (Prüferkommission) | Attest | Scott | 2 a |
| APS, (American Philatelic Society) (Prüferkommission) | Attest | Scott | 3 a |
| APS, (American Philatelic Society) (Prüferkommission) | Attest | Scott | 5 |
| APS, (American Philatelic Society) (Prüferkommission) | Attest | Scott | 14 |
| Alcuri, Paul J. (Sonstiges) | Sonstiges | Michel | 3 I |
| BPA, Expertising Limited (Prüferkommission) | Attest | Stanley Gibbons | 1 |
| BPA, The British Philatelic Association Limit (Prüferkommission) | Attest | Michel | |
| Colla Asinelli, Giorgio (APFIP (Associazione Periti Filatelici Italiani Professioni.)) | Attest | Scott | 6 |
| Eichele, Martin (BPB (Briefmarkenprüfstelle Basel)) | Attest | Michel | 3 I x b/d |
| Eichele, Martin (BPB (Briefmarkenprüfstelle Basel)) | Attest | Michel | 31 x b/d |
| Eichele, Martin (BPB (Briefmarkenprüfstelle Basel)) | Attest | Stanley Gibbons | 1 |
| Eichele, Martin (BPB (Briefmarkenprüfstelle Basel)) | Attest | Stanley Gibbons | 14 |
| Johnson, Richard (Sonstiges) | Attest | ohne Angabe | |
| Knopke, Karl (Sonstiges) | Attest | Michel | 18 |
| RPSL, Royal Philatelic Society (Prüferkommission) | Attest | Michel | 6 a |
| RPSL, Royal Philatelic Society (Prüferkommission) | Attest | Stanley Gibbons | 7 b |
| RPSL, Royal Philatelic Society (Prüferkommission) | Attest | Stanley Gibbons | 18 |
| RPSL, Royal Philatelic Society (Prüferkommission) | Attest | Stanley Gibbons | 24 a |
| Raybaudi, Experts (Prüferkommission) | Attest | Scott | 3 |
| Raybaudi, Experts (Prüferkommission) | Attest | Scott | 14 |
| Rendon, Alex (AIEP (Association internationale des experts en philatélie)) | Attest | Stanley Gibbons | 14 |
| Richter, Heinzgeorg (Sonstiges) | Attest | Michel | 5 a |
| Scheller, Pascal (Sonstiges) | Attest | Stanley Gibbons | 13 a |
