1 / 3 Groschen yellowish green, large shield, having bright colours block of four, tied by Schleswig Holstein dual circuit cancel \"Keitum 30 12 74 5-6 N\", slightly separated, the left stamps defective - the right in normal perforation and perfect condition, blocks of four of this stamp are rare, photo expertize Hansmichael Krug BPP (2020), Michel 1.400.-