1918 registered cover posted from Monastir (Bitola) to Geneva, with very rare Serbian Bitola FPO "BITOLJ/-8.1.18" postmark, fr. with 10x5c (total 50c) French Sower stamps canc. at Salonica by French "TRESOR ET POSTES 504/26-1 18", type IV Serbian censormark and arrival "GENEVE/15.11.18".