Mourning cover fr. with 40l. litho and 5l charity stamp canc. "ΝΑΥΠΛΙΟΝ*17.ΑΠΡ.21", via "ΑΘΗΝΑΙ*18.ΑΠΡ.21" and "ΣΜΥΡΝΗ ΑΦΙΞΙΣ ΣΥΣΤΗΜΕΝΩΝ*22.ΑΠΡ.21" (type ΧII), arr. "ΚΟΡΔΕΛΙΟ*23.ΑΠΡ.21" (type I). Scarce.