Four Yixing teapots and covers 18th century

Four Yixing teapots and covers 18th century, two with cylindrical bodies, two globular, all variously applied in cream slip wih dragons, shou characters, mythical beasts and flowers, all with replacement spouts, 20cm max. (6) One teapot with a letter dated 16th June 1916, bequeathing the same to the recipient and claiming that it was once used by Queen Charlotte of Hanover.