H x W x D: 2.8 x 1.7 x 0.6 cm (1 1/8 x 11/16 x 1/4 in)
Tool and Equipment
Wang Yachen (1894-1983), United States and Shanghai, China 
Benjamin Chou, Potomac, MD, by inheritance from Wang Yachen, to 2000 
Arthur M. Sackler Gallery, given by Benjamin Chou in 2000
 "Mr. Benjamin Chou is the only son of Wang Yachen's goddaughter and [the object was] passed on to him as part of his inheritance" (according to Provenance Remark 1, Joseph Chang, December 8, 2000, in the object record).