Urkunden Prüfgebiet: Bulgarien

Prüfer	Art des Attestes	Katalog	KatalogNr.
RPSL, Royal Philatelic Society (Prüferkommission)	Attest	Stanley Gibbons	40
RPSL, Royal Philatelic Society (Prüferkommission)	Attest	Stanley Gibbons	40
Karaivanoff, Vassil Petkov (Sonstiges)	Attest	Michel	878 U Var.
Karaivanoff, Vassil Petkov (Sonstiges)	Attest	Scott	97 a
Todd, Gregory (AIEP (Association internationale des experts en philatélie))	Attest	Michel	I/III ya
Todd, Gregory (AIEP (Association internationale des experts en philatélie))	Attest	Michel	P 7