This sundial has a surface which is separated in 12 parts representing 12 hours of the day. More particularly, the sundial consists of a hyperbola tracing the shadows path at the winter solstice, a second one for the summer solstice, and a straight east-west line in between marking the equinoctial shadows.
This object has not been measured by the 3D pipeline. Its entry in the catalogue rests on the published description only; no surface fit, latitude or line detection exists for it.