20l/20l 1917 "Κ.Π."surcharges on "ΕΛΛΗΝΙΚΗΣ ΔΙΟΙΚΗΣΙΣ" revenues, red-brown 3-line surcharge, canc. "ΚΑΛΑΜΑΙ*15.ΣΕΠ.17". Very good perforation and postmark as usual Kalamai, mid-September 1917. Two shallow thin spots due to hinge removal, still fine for this very rare stamp. (Hellas C25).