Cover from "ΚΟΥΜΗ" (type I), via "ΑΘΗΝΑΙ*23.ΝΟΕΜ.1840", arr. "ΠΥΡΑΙΕΥΣ*23.ΝΟΕΜ.1840". Postage indication "40" and label "ΛΕΠΤΑ 40". The purpose of this label was to find out resources for Cretan refuges in Greece. Signed O.Vlastos. Extremely rare.