Heinrich Köhler Auction 377 - Day 2

1928  ¼ a printed on thick glazed paper perf 11 complete sheet of eight using two impressions from the Setting of four clichés, top Setting of four printed in indigo and the bottom Setting of four printed in bright blue with error, middle vertical perforation missing resulting in four imperf between horizontal pairs, two in indigo and two in bright-blue (imperf between error not listed in bright blue in SG), certificate ISES 2021.