Lot 40046 – 1866, 50r blue, thick paper of 110 microns, block of four used

1866, 50r blue, thick paper of 110 microns, block of four, very well centred and cancelled by neat cork cancel of diamonds, the only block of four recorded on thick paper and the largest multiple known, with this paper (listed and numbered in the Catálogo Enciclopédico) being much rarer than the bluish paper variety, a most remarkable multiple of this value; ex Dr. de Amaral Machado.