40 Centimes with black letterpress "MEMEL 60 pfennig" overprint and diagonal dark blue "FLUGPOST" overprint, dark grey-red/turquoise-grey on white paper, upper right sheet corner example from position 5 with overprint flaw IIa: "gap between 6 and 0 in value", perfect condition apart from pencil notation in sheet margin, photo certificate Tobias Huylmans (2016) "genuine and faultless", Mi. 450.-