35 Pfg summer Olympic Games watermarked YI, block of four with left upper corner of the sheet, with centered first day special cancel "BERLIN W8 28.9.56", in perfect condition, very scarce watermark-variant, of the in used condition so far only a few copies became known are, in the existing unit all special rarity, photo expertize Paul BPP (2014) "the stamp and the stamp impression are genuine. The condition is perfect. ", Michel unpriced