Block issue "Help for City Kindergartens" with experimental perforation L 11 1 / 4, which affects both the stamps and the block margin, mint never hinged - as issued, postmark PSKOW-k- 3 12 41 in the upper left block margin, above the left stamp is a stock point, and on the lower stamp are purple spots, otherwise the condition is flawless, format 121 x 162 mm, great rarity of the area! unsigned and photo certificate Walter Zirath BPP (2025) "Only very few blocks are known.", Michel 6. 000.-