Military post offices on the Salonica front. Registered cover fr. with 5c+10c+50c. (double weight foreign registered letter rate) and posted from "TRESOR ET POSTES*504*2 8 17" with Serbian censorship canc. "PREGLEDALA/VOJNA CENZURA (37)" and French "OUVERT par lAUTORITE*309" and tape "CONTROLE POSTAL MILITAIRE", via "RAGAZ*19.VIII.17", arr. "WEESEN*1.IX.17". On reverse manuscript note "Parvenu a Pontarlie Centralisateur en mauvais etat un cote ouvert" (= received in pour condition at Pontarlier).