Body, mater, rete, bail, ring, and tympan. Mater of rolled gilt copper; rim soldered to back plate. Limb face with hour scale, labeled XII-XII twice. Plain cavity with notch for tympan. Reverse has 2 concentric calendars with Zodiacal names and months labeled in Latin. Double unequal hour scale, 1-12 from left. 25 star points. Modern rule and alidade. Possibly fake.