1 / 3 Groschen small breast shield, green, unused block of 15 in light, yellowish-greener shade - left above field 51 with clear recognizable plate flaw \"white spot in the upper frame\" (plate J-L-I) - clear embossed with on all sides outstanding faultless rougher perforation! All stamps with untreated original gum - beneath 7 values mint never hinged! A few on face invisible age characteristics (4 values tiny stain spots, on face freshened up; lower alignment horizontal crease) disturb the in total outstanding general impression this largest, hitherto registered unit the no. 2 in no way; unique Museum piece for the large collector, ex Kosack, photo expertize Sommer BPP\". Great rarity the breast shields philately and unique in in total good condition\"