Lot 50229 – 1866 20par black on rose thick paper, the superb and fresh mint block of ten, with full original gum

1866 20par black on rose thick paper, the superb and fresh mint block of ten, with full original gum without blemish, the largest known multiple of this stamp, which exhibits all three of the S.G. and Scott listed types, exceptional quality, unique and the most important item of 20par on thick paper; a block of nine was part of the Cornelia collection and was described as the largest known multiple and sold in 2007 for 5,400CHF; cert. Gmach (2021).