Military post offices on the Salonica front. Cover from "VOJNA POSTA*Br.111*18.11.17" fr. with 5c+20c (foreign letter rate) and cancelled with "TRESOR ET POSTES*510*3 12 17" with Serbian censorship canc. "PREGLEDALA/VOJNA CENZURA (11)", via "VOJNA POSTA*Br.999*19.11.17", arr. "LAUSANNE 11 GARE*24 I 1918".