Spherical ivory dial. Two separable hemispheres. Designed to be suspended as a pendant from ribbon or chain. Wire remnants of a suspension ring remain. Hour scale for a compass dial on hemisphere A. Arabic numerals. Gnomon, compass needle and glass missing. Polychrome, illuminated compass card with points in red, blue, green and gold. Brass pin of unknown usage on hollow hemisphere B. Ring of 30 Gregorian epact numbers inscribed on outside of each hemisphere.