Egg-shaped brass shell, formed by soldering together two halves at a vertical seam, and fitted with a shaped top and a circular mount at the bottom with an internal screw thread.
There are eight vertical slits, numbered 1 to 8, each terminated by a small circular hole; the cardinal directions have longer slits, with shorter ones between them. They are bisected by a central horizontal line.
Signed around the mount: 'ALESdrr POLco VAZla'.
Shaped wooden case in two parts, lined with buckram, with a vertical seam; a central brass band riveted to the case on the outside has a catch and hinge.
The stand is modern.