Sassone #22a 1918 10f red, machine overprint, neatly cancelled by "Fiume" c.d.s at base, leaving the design quite clear, a very fine example of this exceedingly rare stamp of which very few are recorded; as a result of its great rarity, this stamp is listed but unpriced in the Sassone catalogue; 2018 Raybaudi certificate. (Image)

Est. $5,000-7,500