Lot no. 15703

1854, Unissued, 20 c. indigo block of four from positions 8-9 / 13-14 of the pane of fifty, showing the variety background colour print inverted, large part original gum, lower pair never hinged, large even margins, very fine and scarce. Cert. Colla (2009) and Cardillo (2015) (Michel 8c)