50l./2dr. 1901 First Olympics AM surcharges in mint bl.4 (pos.53/54+58/59). The only bl.4 of the sheet with all the "0"s wide. Possibly UNIQUE (only this one is known so far) (Mascini combination W-W/W-W). Lower pair mint never hinged. Suprb. (Hellas 167a - 5500E++++).