Late Qing Dynasty, signed Wu Yunshan. The short cylindrical sides inscribed, the interior divided into two ying-yang-shaped sections, one glazed in light green and the other in cream, the base with an impressed Wu Yunshan zhi mark, 12.5cm diameter. 清晚期 宜興紫砂筆洗,陰刻「吳雲山」款 款識:「清香,放陶刻。」