Urkunden Prüfvereinigung: Sonstiges

Prüfer	Art des Attestes	Katalog	KatalogNr.
Oliva, Guglielmo (Sonstiges)	Attest	Yvert et Tellier	21
Crowe, William T. (Sonstiges)	Attest	Scott	21
Roumet, Alexandre (Sonstiges)	Attest	Michel	21
Pascanu, Leonard (Sonstiges)	Attest	Michel	21
Williams, Mike (Sonstiges)	Attest	Stanley Gibbons	21
Sydney Philatelic Research, Drury, Michael (Sonstiges)	Attest	Stanley Gibbons	21
Simmermacher, René (Sonstiges)	Befund	Stanley Gibbons	21
The One Cent Franklin Plating Archive, Richard Doporto (Sonstiges)	Attest	Scott	21