10l orange on blue, double control number, one inverted (Kound. 30.10) tied by "1" (Athens) cds. Control number printed inverted is very clear while a second control number is printed upright very lightly. One possible explanation is that the upright numbers were printed first very lightly so the sheet was fed into the press once more, wrongly this time so that the second numbers were printed inverted. No matter which number was printed 10l orange on blue, double control number, one inverted (Kound. 30.10) tied by "1" (Athens) cds. Control number printed inverted is very clear while a second control number is printed upright very lightly. One possible explanation is that the upright numbers were printed first very lightly so the sheet was fed into the press once more, wrongly this time so that the second numbers were printed inverted. No matter which number was printed