6 penny to 90 penny "Gorochow", set in blocks of four from corner margin lower left, all values on dull art paper, the corner edge stamp whitens always the plate flaw "small s in German" on, a value to 60 Pfg blotched - otherwise in perfect condition mint never hinged, issued only 1.200 sets - accordingly rare are multiples, expertise Brunel VP (2020), Michel 4.480.- (17/20(4)) Certificate (Image 1) (Image)