Lot 40104 – 1866, 100r green, type IV, die III, single on front and block of four on reverse

1866, 100r green, type IV, die III, single on front and block of four on back of envelope (opened for display) from Barreiro to Genzano correctly paying the single rate to Italy, tied by « Barreiro/13 Oct. 75 » French-type cds, the block also tied in transit at Rio and Italian transit alongside; some faults although the largest block recorded on cover, with just two known; the first example of postal history for this value listed under « Peças Speciais » (special items) by Paolo Comelli in the « Mosaico » magazine.