Lot 40045 – 1866, 50r blue, the vertical mint block of six

1866, 50r blue, the vertical mint block of six, centred to the left and possessing original gum, couple of evry small and light thin spots not detracting; one of the four second largest mint multiples known, with only two possessing original gum and offered in this sale, this probably being the superior of the four as a result of being the only one recorded disposed vertically and one of two without tone spots. Large mint multiples of this value are very rare, with only five recorded being larger than a block of four, the largest being a block of 12; ex Dr. de Amaral Machado.