Dial in the shape of a small spotted-ivory box, complete with a screw-on lid whose inside carries a disk showing the phases of the Moon and a converter for changing lunar hours into solar hours. At the bottom of the box is a compass for orienting the dial, with a windrose on colored paper. There is a glass and an hour circle fitted with a gnomon. The dial is calibrated for latitude 45°30'. Provenance: Medici collections.