A VERY RARE PAIR OF DOUCAI WATER POTSYONGZHENG SIX-CHARACTER MARKS IN UNDERGLAZE BLUE WITHIN DOUBLE CIRCLES AND OF THE PERIOD (1723-1735)Each vessel is finely painted and enamelled around the incurving sides with swirling clouds circling the base and rising to two tall trailing formations, the clouds formed as overlapping whorls with ribbed edges picked-out in delicate tones of green, aubergine, blue, yellow and highlighted with iron-red, the interior and base with a transparent glaze.2 3/8 in. (6 cm.) diam., box