The Ministerial post office on Corfou. Cover fr. with 10c+15c. French stamps canc. with linear "POSTES SERBES" and posted from "MINISTARSKA*28.4.1917" with Serbian censorship canc. "CENSURE/MILITAIRE SERBE" in black and French "OUVERT par lAUTORITE MILITAIRE*306" and tape "CONTROLE POSTAL MILITAIRE" to Geneve.