Military post offices on the Salolica front. Cover fr. with 2x10c+5c. (foreign letter rate) and posted from "BITOLJ*22.3.17" with Serbian censorship canc. "PREGLEDALA/VOJNA CENZURA (32)" in black, arr. "VOJNA POSTA*Br.999*23.3.17" in black. The town of Bitolj was liberated in November 1916. According to M.R.Vukovic study, this censor marking was used at M.P.O. Bitolj from the end of March til early April 1917.