20l. sky-blue in pair (pos.17-18), clear to good margins, plate flaw white spot on Greek border and "0" Groom No.6 on pos.17 and plate flaw thin circle and "0" of C.F. inverted (Kound.38.2) on pos.18, used. Pos. 18 stamp with a small scratch at upper right, otherwise Fine to Very Fine. (Hellas 27a+27aNb).