Old conch shell on turned wooden base Napoleon III vintage cabinet of curiosities

Magnificent old cassis cornuta conch shell mounted on a napoleon III turned wooden base, late 19th century. Height: 19 cm - 7 1/2 inches. Height of the foot: 7 cm - 3 inches. Shell width at the widest point: 12 cm - 4 3/4 inches. Depth: 9 cm - 3 1/2 inches. Base diameter: 6 cm - 2 1/4 inches. Weight: 600 grams.