| Prüfer | Art der Urkunde | Katalog | KatalogNr. |
|---|
| APS, (American Philatelic Society) (Prüferkommission) | Attest | Scott | 62 X 3 |
| Confederate Stamp Alliance, (CSA) (Prüferkommission) | Attest | ohne Angabe | |
| Jakubek, Wolfgang (BPP (Bund Philatelistischer Prüfer)) | Attest | Scott | 9 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) | Attest | Scott | 1 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) | Attest | Scott | 2 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) | Attest | Scott | 3 |
| PSAG (Philatelic Stamp, Authetication and Grading) (Prüferkommission) | Attest | Scott | 3 |
| PSE, Professional Stamp Experts (Prüferkommission) | Attest | Scott | 3 |
| PSE, Professional Stamp Experts (Prüferkommission) | Attest | Scott | 8 |
| PSE, Professional Stamp Experts (Prüferkommission) | Attest | Scott | 13 |
| PSE, Professional Stamp Experts (Prüferkommission) | Attest | Scott | 14 |
| Sloane, George B. (Händlergarantien) | Prüfermitteilungen | Scott | 81 X I |
| Society of Philatelic Americans, S.P.A. (Prüferkommission) | Attest | Scott | 11 e |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 3 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 4 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 4 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 6 P5 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 9 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 9 a |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 11 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 11 c |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 11 e |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 12 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 58 X 2 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 81 X I |
