10 billions Mark on 50 millions Mark, b-colour black opal green, local overprint of the Regional Directorate of Posts Koenigsberg (2. OPD-edition) upper edge configuration of the cylinder / 1'5'1, stamp unused with rest of hinge, upper margin with small trace of crease, unsigned, photo expertize Dieter Weinbuch BPP (2021), "examples of this issue with upper margin local overprint of the Regional Directorate of Posts Koenigsberg in this cylinder line configuration are not common", Michel 750.-