10l. red-orange on blue (pos.80), "1" inverted on control numbers!!! It is not Athens consecutives printing, nor 1871/76 meshed paper stamp. Inverted "1" exists only in the 1st 1867/69 setting of 10 lepta value but in pos.80 "1" upright is upright. Bottom margin cuts stamp at right and a small thin but very rare and paradox case since inverted "1" never reported for these printings in pos.80. (Hellas 26cNa).