Three Yixing teapots and covers 19th / 20th century

Three Yixing teapots and covers 19th / 20th century, one miniature pear-shaped with a domed cover, one with a short curved spout, the last with the cover lying flush to the shoulder, all of a chocolate brown tone, script mark to one, 20cm max. (6) Provenance: the Arthur J Harris collection.