On turquoise green, the rare 1st impression in mint condition without gumming 6 Kr. black spreads three sides Georg Bühler till very large margins, vertical above left, decorative and in fresh color copy of the rare stamp, signed and new small crease and class thinned certificate Stegmüller BPP (2012): "mint copies of this stamp are rare."Michel, 2.800.-- German states rareness offered hardly once in mint condition!