10 billion Mark blackish green-yellow/olive-green, flat-plate printing, perforated, Rosette design 1923, variety: double print of stamp design, centrally struck double-circle KARLSRUHE 22.11.23 4-5 V * BADEN 1, stamp with shortened perforation and pinpoint cancel ink erosion at top, hardly significant given the variety's rarity, photo certificate Weinbuch BPP