A JAN VAN DER VAART POTTERY VASE, double waisted cylindrical shape, speckeld surface in blue and tones of grey, blue rims (small chip to underside base), incised and stained artist's signature vd Vaart and dated 80, 17.3 cm high; AND A JAN VAN DER VAART POTTERY VASE, cylindrical shape narrowing to a diabola shape top, black speckling, on a brown ground, incised artist's signature vd Vaart and dated 80