Late Qing Dynasty, each thickly molded in the silhouette of a butterfly with a flat rim and two raised horizontal ribs extending around the low upright walls, the greyish-green glaze covering all surfaces except the short feet, the remains of spur marks visible on the flat base bearing the six-character Qianlong mark in underglaze blue seal script, good condition, private New York collection; 9 3/4 in. (24.8 cm) wide