Rural dotted "621" on cover from Φυλάκιον Κακαβιάς fr. with 10 lepta stamp (reduced postal rate correspondence), cachet "ΔΙΜΟΙΡΙΑ ΠΡΟΚΑΛΗΨΕΩΣ ΚΑΚΑΒΙΑΣ", via "ΔΕΛΒΙΝΑΚΙΟΝ*17.ΔΕΚ.37", arr. "ΑΘΗΝΑΙ-ΠΑΓΚΡΑΤΙΟΝ*20.XII.37". Rare.