60 copies on 1 Pfennig Hindenburg, overprint in black-violet as a corner piece on the upper right in the rotary printing process, cancelled with a Cyrillic stamp "BORI ... 41", flawless condition, signed E Keiler and photo certificate Walter Zirath BPP (2025) "The edition of these stamps is only 200 pieces, stamped especially as a corner piece, these stamps are extremely rare.", Michel 6.000.- - an exceptional piece of the rare stamp!