30, 33 (57, 59) 1890-91 1d on 4d ultramarine Orange Tree surcharged, VARIETY - surcharge Roman numeral "I" instead of "1" (SG Type 7c), very rare and seldom seen, significantly undercatalogued, as it occurred only once in the sheet of 240 for SG 57 & 58, in horizontal pair with SG 57.
