1850, 3 Kreuzer carmine bright brownish, handmade paper (silk paper 0, 07 mm), type Ia, ultra-fine printing, horizontal pair in the on all sides having full margins cut in fresh colours choise copy condition, used with black box cancel "Prague 1. / 11.2 U", photo expertize Prof. Dr. Ulrich Ferchenbauer (2020) "effective exquisite item! Of this rare colour shade. "