Military post offices on the Salonica front. French Patriotic postcards. Registered printed PPC from "V.P.XX", fr. with 50c. (overpayment of 35c. foreign registered PPC rate) and canc. with "TRESOR ET POSTES*504*3 1 18" with Serbian censorship "PREGLEDALA/VOJNA CENZURA (77)", arr. "GENEVE*21.I.18".