Three bronze hand warmers, Qing dynasty, 19th century, comprising one of octagonal form, the cover pierced with a crane medallion on a florette diaper ground; another of chamfered rectangular form, the cover pierced with figures in a landscape, the base of each with impressed mark; and one of circular form, the cover pierced with Y-motifs, mark, (3), 11 cm wide; 11.5 cm wide; and 6 cm diameter