Military post offices on the Salonica front. Stamps cancelled with censor markings. PS fr. with 10c. cancelled with Serbian censorship "PREGLEDALA/VOJNA CENZURA (15)" and posted from "VOJNA POSTA*Br.56*5.8.17", via "VOJNA POSTA*Br.711*6.8.17" and "VOJNA POSTA*Br.999*8.8.17" with French censorship "ARMEE DORIENT 17/CENSURE MILITAIRE G", triang "N.O" and Italian "MILANO/POSTA ESTERA" to Geneve.