45 Centimes with black typographic overprint "MEMEL 80 pfennig" and oblique, dark blue overprint "FLUGPOST", dark green / ultramarine on GC paper b, postmarked "MEMEL * 1 f 12. 7. 21 N", on a small piece of mail, flawless condition, photo certificate Tobias Huylmans (2016) "genuine and flawless"