60 Kop. on 1 Pfennig Hindenburg, black-grey-violet overprint, upper right corner example, rotary printing, Cyrillic "BORI ... 41" cancel, perfect condition, signed EKeiler and photo certificate Walter Zirath BPP (2025) "Printing only 200 stamps, extremely rare used, especially as corner examples.", Mi. 6.000.- - exceptional example of rare stamp!