Si Gan Cao Tang four-character mark, 18th century Of archaistic zun form, the splayed round foot decorated with eternity symbols, the bulging octagonal mid section encircled by two bands of lappets divided by a band of floral sprays, the flared neck further incised with stiff upright leaves, the dense design further accentuated with key-fret and cloud borders, all under a rich turquoise glaze pooling to darker blue in the recesses of the decoration, the base unglazed and incised with the four-character mark. 10.5cm (4 1/8in) high.