Military post offices on the Salonica front. Censor Tapes. Registered cover fr. with 10c+40c. and posted from "TRESOR ET POSTES*504*14 12 17" with Serbian censorship "PREGLEDALA/VOJNA CENZURA (42)" in violet and tape "Controle Postal Militaire Serbe" in red (type II), arr. "GENEVE*7.I.18". Censor tapes were available, but only rarely used.