, unused with part original gum (variety unmounted); some minor discolouration otherwise fine. Rare, S.G. 38da, £2415. Photo" /> unused Block of Four 1915-28 3rd. wmk., 6d. bright ultramarine (Die IIB) corner block of four, one showing<I> "leg of kangaroo broken"</I>, unused with part original gum (variety unmounted); some minor discolouration otherwise fine. Rare, S.G. 38da, £2415. Photo | Christie's