Military Post Offices. Degree of Rarity. PS posted from "VOJNA POSTA*Br.20*3.7.18" (M.R.Vukovic study page 175, rarity GV) with Serbian censorship "PREGLEDALA/VOJNA CENZURA (41)", via "VOJNA POSTA*Br.315*4.7.18" to Br.222.