80 Kopecks North pole flight with overprint "RASEINIAI 1941. VI. 23. ", variety "inverted overprint", date-appropriate cancelled "RASEINIAI *a* 24. VIII. 41" on piece, very fine, rare stamp, expertized Krischke, photo expertize Tobias Huylmans BPP (2025) "genuine and immaculate", Michel 1.100.-