Prussia, Karlfried Krau+?, \"the Prussian nummeral cancel\" (2009), 584 sides, complete in colour, parts documentation (140 S. ) and catalogue (444 S. ), partly bilingual German and English, with illustration of all nummeral cancel, for the first time with illustration the types & whose valuation lots and on cover, documentation of all relevant decrees in the original, cover in leather, with slipcase, very rarely offered!