unmounted mint Block Larger Than four 1977-82 Definitives, 3c. perf 14x13½., an upper left corner block of ten (5x2) with the corner block of four imperforate and the adjoining pair imperforate on three sides, and a marginal block of twelve (6x2) with the left pair imperforate on three sides, unmounted mint. Spectacular unlisted errors. S.G. 416a var.