100 million, dark greenish grey, with serpentine letterpress Dienstmarke overprint, block of four, repeatedly cancelled with barred bridge datestamp "KALKBERGE * (MARK) b 30.11.23 11-12V", lower left stamp with variety PE1 = parallel variety, perfect condition, unsigned, photo certificate Dieter Weinbuch (2021) "fresh colours, very good perforations, in faultless condition", Mi. 800.-