used 6d. olive-green and pale blue, a horizontal pair [21-22] with [22] showing "COIUMBUS" variety, fine used. S.G. 169a, £650. Photo

Details
used 6d. olive-green and pale blue, a horizontal pair [21-22] with [22] showing "COIUMBUS" variety, fine used. S.G. 169a, £650. Photo