A lacquered brass universal equinoctial ring dial, unsigned, the meridian ring divided 90°-SN-80°, the pivoted equinoctial ring with I-XII(x2)hours scales, the reverse meridian divided 0-90, equinoctial ring 90-0, the bridge with sliding pin-hole sight, against calendrical, zodiacal and declination scales, 18th Century - 8 7/8in.inch