1st days of military occupation of Andrianople. Post free mail posted from "ANDRINOPLE 4*10-7-20" (octagonal mark) to Constantinople. After the occupation was send to "ΘΕΣΣΑΛΟΝΙΚΗ (ΑΠΟΣΤΟΛΗ)*21. ΙΟΥΛ. 20", arr. "ΤΑΧ.ΤΟΜΕΥΣ 920*28 ΙΟΥΛ. 20". Extemely rare.