Registered cover from BP.999 to Geneve. Linear "POSTES SERBES", fr. with 25c+40c French stamps, both canc. by pen. On reverse canc. "ΘΕΣΣΑΛΟΝΙΚΗ*13.ΜΑΙ.18", arr. "GENEVE*1.VI.18", re-addressed to Weesen. French censor tape and cachets "1" and "3". Serbian censor cachet (7) in lilac (type VII).