Lot 40016 – 1866, 10r vermilion-carmine, horizontal block of six with inverted imprint

1866, 10r vermilion-carmine, horizontal block of six from the lower right corner of the sheet, showing marginal Spanish A.B.N. inscription on two sides, the one at bottom being inverted, unused without gum and with some usual ageing, insect holes in the marginal corner; the additional shade of this stamp (RHM 23a) is unrecorded with inverted imprint in the Brazilian RHM catalogue; the only example known; ex Chusyd.