Two enamelled Yixing teapots and covers 2nd half 18th century

Two enamelled Yixing teapots and covers 2nd half 18th century, the tapered square-section bodies painted with panels of flowers on a turquoise and pale green ground, impressed marks to the bases, 19cm. (4) Provenance: the Arthur J Harris collection. Illustrated: Patrice Valfré, Yixing Teapots for Europe, nos.61 and 62.