Glazed porcelain ‘Dan Ping’ vase with poem, with seal on the base

A slender-looking ‘Dan ping’ 胆瓶 porcelain vase with an elongated, straight neck on a rounded belly, set on a circular foot. On a pristine white background, it is adorned by a pattern of poems executed in underglaze blue and arranged vertically. 

With a four-character ‘宣德年制’ stamp on the base. 

Height: 20 cm; Mouth diameter: 3 cm; Base diameter: 5.5 cm