30 Kopecks special stamp "agriculture exhibition - Leningrad and north-east the RSFSR" with black typography overprint "Laisvi Telsiai 1941. VI. 26" in type I the 2nd issue, position 19, from left margin of sheet, mint never hinged, very fine, issued only 360 examples, unsigned, photo expertize Tobias Huylmans BPP (2025) "genuine and immaculate", Michel 450.-