Cover fr. with 2X1l.+3l.+2X5l.+10l. 1913 Campaign stamps canc. "ΣΕΡΡΑΙ*19.ΑΠΡ.13" and "ΤΑΧ. ΣΕΡΡΩΝ", via "ΘΕΣΣΑΛΟΝΙΚΗ*20.ΑΠΡ.13", arr. (London) "8.MY.13". (Hellas 340+342+343+344).