Entire letter written "είς Γαλάζιον/εν Πειραιει την 23 Μαίου 1861", canc. "ΠΕΙΡΑΙΕΥΣ*23.ΜΑΙΟΣ.61" and "Π.Ε.Δ." in red, arr. "ΓΑΛΑΖΙΟΝ (ΜΟΛΔΑΥΙΑ)*29.ΜΑΙΟΣ.61" in blue (type III). THIS IS THE ONLY KNOWN. A piece of the greatest rarity for pre-adhesive period.