1918: Hungary 10 f. red with inverted ovpt. "FIUME" in a hor. strip of five, tied by crisp "FIUME 918 DEC 22 N 10" cds's to registered envelope within the city. Only known multiple of this exceedingly rare stamp which had a printrun of 50 copies. Signed Raybaudi, cert. Renato Mondolfo (1992) Sassone = EUR 100'000 for five used stamps.