Compare a very slightly smaller square stool, one of a pair in the collection of the Central Academy of Arts and Crafts, illustrated in Wang Shixiang, Classic Chinese Furniture - Ming and Early Qing Dynasties, Hong Kong, 1986, p. 60, pl. 13, and Wang Shixiang, Connoisseurship of Chinese Furniture: Ming and Early Qing Dynasties, Hong Kong, 1990, vol. II, p. 21, A11.
See, also, a very similar stool formerly in the collection of George N. Kates, illustrated in Sarah Handler, "George Kates: A Romance with Chinese Life and Chinese Furniture," Journal of the Classical Chinese Furniture Society, Spring 1992, p. 70, fig. 2.
Another closely similar pair in the Chen Chite Collection is illustrated in Splendor of Style: Classical Furniture from the Ming and Qing Dynasties, National Museum of History, Taipei, 1999, pp. 74-75.