A celadon-glazed seal paste box and cover, Baoliang cangzhen mark, Qing dynasty, 18th century | 清十八世紀 粉青釉印泥蓋盒 《葆靈藏珍》款

The mark to the base of the box reads Baoling cangzhen, which translates to the collection of Baoling, is a private mark found on ceramic pieces of the Qianlong period, see Geng Baochang, Ming Qing ciqi jianding [Appraisal of Ming and Qing porcelain], Hong Kong, 1993, p. 400.

底款《葆靈藏珍》為乾隆時期堂名款，見耿寶昌，《明清瓷器鑑定》，香港，1993年，頁400。