5 Franc with red typography overprint "Memel 10 Mark" bright gray ultramarine / pale brown-ochre, right side margin piece, with overprint flaw Ia: "further gap between 1 and 0 the indication of value, Feld10", mint never hinged, very fine, photo expertize Tobias Huylmans (2019), "genuine and immaculate", Michel 600.- plus