on 25c. indigo, a lower left corner vertical strip of three, variety surcharge inverted, fine unmounted mint. A rare multiple. S.G. 51a, £1125. Photo" /> unmounted mint 1890 (Dec.)<I> "Two/Cents."</I> on 25c. indigo, a lower left corner vertical strip of three, variety surcharge inverted, fine unmounted mint. A rare multiple. S.G. 51a, £1125. Photo | Christie's