2 gr. ultramarine blue (azzurro oltremare), plate I, Naples paper, horizontal pair, pos. 77 and 78 with retouch, nice vivid colour and large even margins, tied to letter sheet from Messina, 20.4.1859, to Girgenti. Very fine and fresh. A rare letter. Signed Alberto Diena and Giulio Bolaffi with certificate (1969) (Sassone 6d)
