Military post offices on the Salolica front. Registered cover fr. with 2x25c. (foreign registered letter rate) and posted from "BITOLJ*9.4.18" with Serbian censorship canc. "PREGLEDALA/VOJNA CENZURA 13", arr. "VOJNA POSTA*Br.999*12.4.18" in black. The town of Bitolj was liberated in November 1916. According to M.R.Vukovic study, this censor marking was used only at V.P.Br.999.