Lot 40556 – 1859 20c deep blue, stone B, horizontal block of 18

1859 20c deep blue, stone B, horizontal block of 18 from the upper right corner of the sheet, positions 6-11 / 17-22 / 28-33, original gum and without the remarkable traces of tone spots usually encountered in multiples of this value, one stamp cut into in lower right corner, showing oval embossed seal in right margin (not mentioned in the certificate), small thin spot only affecting one design and couple of vertical creases not detracting; to our knowledge, the only multiple recorded of this stamp showing an embossed seal; cert. Club Filatélico de Bogotá (2019, not mentioning the variety).