10 billion Mark on 20 million Mark black-blue, provisional issue August 1921, local printing of OPD Stettin, complete STETTIN 23.11.23 6-7 * 1 s cancel, according to BPP expert Dieter Weinbuch genuine and in period, diagonal crease and two shortened perforation tips at bottom, nevertheless attractive example of this stamp, very rarely encountered used, photo certificate Weinbuch BPP