Registered cover fr. with 3x20l. lithos and 5l+10l 1917 Provisional Government issue canc. "ΜΥΤΙΛΗΝΗ*16.ΣΕΠ.17" to Paris. Censor tape "CONTROLE POSTAL MILITAIRE" and cachet "ARME DORIENT/CENSURE MILITAIEE" and triangular "NO". Wax-seal on reverse.