FOUR VARIOUS LARGE BLUE AND WHITE 'DOUBLE-PHOENIX' SAUCER-DISHES , each with shallow rounded sides and slightly flaring rim, the centre painted with two confronted phoenixes amidst clouds, the reverse with two flying phoenixes amidst clouds, including one with a Daoguang seal mark, one with a Tongzhi six-character mark, one with a Guangxu six-character mark and one with a Xuantong six-character mark and of the period