Military post offices on the Salonica front. Registered cover, Serbian registry mark (used in August 1918), fr. with 50c. and posted from "TRESOR ET POSTES*504*21 8 18" with Serbian censorship "PREGLEDALA/VOJNA CENZURA (99)" in violet, arr. "WEESEN*16.IX.18". These Serbian markings used at V.P.Br.216 and V.P.Br.222 were crossed out and replaced with "TRESOR ET POSTES*504" handstamp and manuscript "R" marking.