Urkunden Prüfgebiet: Thailand

Prüfer	Art des Attestes	Katalog	KatalogNr.
Siam Stamp, Expert Committee (Prüferkommission)	Attest	Stanley Gibbons	107; 108
Osper, Horst (Sonstiges)	Attest	Sonstige	154 - 165
Osper, Horst (Sonstiges)	Attest	Michel	16 III
Osper, Horst (Sonstiges)	Attest	Michel	171 C
Osper, Horst (Sonstiges)	Attest	Sonstige	237 - 244
Osper, Horst (Sonstiges)	Attest	Sonstige	295 - 299
Osper, Horst (Sonstiges)	Attest	Sonstige	302 a
Osper, Horst (Sonstiges)	Attest	Sonstige	339 - 343