The Ministerial Post Office on Corfou. Registered cover fr. 50c. French stamp (foreign reg. letter rate) canc. with linear "POSTES SERBES" and posted from "MINISTARSKA*29.6.17-16" (date bar changed to include the hour) with Serbian censorship canc. "GLAVNA/VOJNA POSTA" in black (possible last day of the use), arr. "GENEVA*27.VII.17".