The Ministerial Post Office on Corfou. Military PS fr. with 10c French stamp cancelled with linear "POSTES SERBES" and posted from "MINISTARSKA*3.5.1917" with Serbian censorship canc. "CENSURE/MILITAIRE SERBE" (type XIII/A, M.R.Vukovic study, page 196) and French censorship "OUVERT par lAUTORITE MILITAIRE/309" to Geneva.