25 Pfennig Crown/Eagle dark orange with inverted "Marianen" overprint, plate upper margin, sheet position 6, unused, perfect condition, expertised Richter and others, photo certificate Ronald F. Steuer BPP (2020): "This is a genuine steep inverted overprint in the characteristic impression strength of the sheet issued only in Berlin ... can be described as unique in this form", Mi. 2.800.- for a stamp without upper margin, upper marginal value not listed in Michel.