Block issue "Red Cross" without watermark, variety "without cross in stamp color in the upper border line", upper right stamp with plate flaw I ("X" instead of "K"), format 114 x 157 mm, mint never hinged, partially toned due to storage, otherwise flawless condition, rare proof print that has not yet been cataloged in Michel, top rarity of the area, unsigned and photo certificate Walter Zirath BPP (2025) "This is a very rare proof print. No other block is known so far."