1917 "Κ.Π." surcharges. Small collection of 21 stamps, u/m. Superb. (Hellas C5+C6+C6A+C7+C8+C9+C9A+C9D+C9E+C10+C11a+C11A+C12+C12A+C13+C16+C17+C17A+C18).