60 Kopecks, imperforated horizontal strip of five! with overprint "sample" in the right lower margin of sheet, on ungummed, brownish paper! in perfect unused condition, extremely rare! (with official regarding notice "miniature sheets proof sample"), unsigned, photo expertize Gerhard Krischke BPP: ". the condition is perfect. it is proofs to the submission in the approval procedure. it should be a unique piece act. ", Michel .