George Jacobus Johannes van Os (Amsterdam 1805-1841)
Two studies of swallowtail butterflies, wings extended and closed (pl. 2)
watercolour, black framing lines, one with fragmentary watermark
3 7/8 x 6 3/8 in. (9.8 x 16.3 cm.); and 4¾ x 6¾ in. (12 x 17 cm.) (2)
George Jacobus Johannes van Os (Amsterdam 1805-1841)
Two studies of swallowtail butterflies, wings extended and closed (pl. 2)
watercolour, black framing lines, one with fragmentary watermark
3 7/8 x 6 3/8 in. (9.8 x 16.3 cm.); and 4¾ x 6¾ in. (12 x 17 cm.) (2)
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