on 25c. indigo, a marginal block of fifteen (3x5) from the left of a sheet, fine unmounted mint. S.G. 52, £1275" /> unmounted mint Block Larger Than four --<I> "Eight/Cents."</I> on 25c. indigo, a marginal block of fifteen (3x5) from the left of a sheet, fine unmounted mint. S.G. 52, £1275 | Christie's