50 Heller delivery stamp bright magenta, vertical "Karlsbad 1.X.1938 + swastika" overprint along right side, perfect used KARLSBAD 1 4.X.38 4d on piece, printing only 232, Robert Brunel VP photo opinion (2018): "Condition faultless. Only three examples with vertical overprint have so far been submitted.", Mi. 2.500.-