50 Heller Kaschau Stamp Exhibition, vertical gutter pair from right side margin, vertical dark rose handstamps facing right, "Karlsbad 1. X. 1938 + swastika", cancelled KARLSBAD 1 4.X.38 4d on piece, perfect condition, printing only 118 gutter pairs, expertised Mahr BPP and Brunel VP photo certificate (2014): "Condition faultless...eight examples with vertical overprints known so far", Mi. 4.000.-