1l/3l 1917 "Κ.Π." surcharges on Fl.Mercury stamp in full sheet of 100 (printing without K.M.), 7 different overprint varieties, 21 in total, u/m. (Hellas C6+C6XII+C6III+C6XVIII+C6IX+C6V+C6XI+C6VII, catalog = 288 euros for the var stamps).