| Prüfer | Art der Urkunde | Katalog | KatalogNr. |
|---|
| Robineau, J. (Sonstiges) | Attest | Scott | C 2 |
| Rossica, The Society of Russan Philately (Prüferkommission) | Attest | Scott | C 68 b |
| Rossica, The Society of Russan Philately (Prüferkommission) | Attest | Scott | 362 |
| Sadri, Mehrdad (Sonstiges) | Attest | Scott | 1 |
| Sadri, Mehrdad (Sonstiges) | Attest | Scott | 6 |
| Sadri, Mehrdad (Sonstiges) | Attest | Scott | 223 |
| Sadri, Mehrdad (Sonstiges) | Attest | Scott | 567 |
| Sadri, Mehrdad (Sonstiges) | Attest | Scott | 587 |
| Sadri, Mehrdad (Sonstiges) | Attest | Scott | 877 - 901 |
| Sadri, Mehrdad (Sonstiges) | Attest | Scott | 896 var |
| Scheller, Pascal (Sonstiges) | Attest | Scott | 7 B |
| Scheller, Pascal (Sonstiges) | Attest | Scott | C 9 |
| Scheller, Pascal (Sonstiges) | Attest | Scott | 9 X 1 |
| Scheller, Pascal (Sonstiges) | Attest | Scott | 12 |
| Scheller, Pascal (Sonstiges) | Attest | Scott | 13 |
| Sismondo, Sergio (Sonstiges) | Attest | Scott | 1 |
| Sismondo, Sergio (Sonstiges) | Attest | Scott | C2 |
| Sismondo, Sergio (Sonstiges) | Attest | Scott | C 3 b |
| Sismondo, Sergio (Sonstiges) | Attest | Scott | 4 |
| Sismondo, Sergio (Sonstiges) | Attest | Scott | 14 (12) |
| Sismondo, Sergio (Sonstiges) | Attest | Scott | 35 - 40 |
| Sismondo, Sergio (Sonstiges) | Attest | Scott | C 68 |
| Sismondo, Sergio (Sonstiges) | Attest | Scott | 81 - 97 |
| Sismondo, Sergio (Sonstiges) | Attest | Scott | 140-143 |
| Sismondo, Sergio (Sonstiges) | Sonstiges | Scott | 3 |
| Sloane, George B. (Händlergarantien) | Prüfermitteilungen | Scott | 81 X I |
| Society of Philatelic Americans, S.P.A. (Prüferkommission) | Attest | Scott | 11 e |
| Sorani, Silvano (APFIP (Associazione Periti Filatelici Italiani Professioni.)) | Sonstiges | Scott | J 19 a |
| Sydney Philatelic Research, Drury, Michael (Sonstiges) | Attest | Scott | 125 |
| Sydney Philatelic Research, Drury, Michael (Sonstiges) | Attest | Scott | O 125 |
| The American Philatelic, Expertization Service (Prüferkommission) | Attest | Scott | 5a |
| The China Stamp, Society, Inc (Prüferkommission) | Attest | Scott | 55 |
| The Egypt, Study Circle (Arbeitsgemeinschaft) | Attest | Scott | C 3 a |
| The One Cent Franklin Plating Archive, Richard Doporto (Sonstiges) | Attest | Scott | 7 |
| The One Cent Franklin Plating Archive, Richard Doporto (Sonstiges) | Attest | Scott | 8 A |
| The One Cent Franklin Plating Archive, Richard Doporto (Sonstiges) | Attest | Scott | 21 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | var |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | C 1 a |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | LO 1 TC 5 a |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 1 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 2 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | C2 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | L 02 P 2 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | E 2 SE |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 2 XU I |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 2 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 2 c |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 3 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | C 3 |
| The Philatelic Foundation, (Prüferkommission) | Attest | Scott | 3 |
