KBWZ Germany 1991, Michel-No. 1512-19 with special cancellation BERLIN 1991, April 9th: "Youth stamps 1991 - endangered butterflies " Eight top right corner edges with additional corrected value prints (KBWZ) complete: "4,50", "7,50", "9,00", "10,00", "11,50", "13,50", "15,00" and "20,00" D-Mark. Stamps in perfect condition with full gum, not folded. Authenticity warranty. Rarely offered!