A rare Ottoman brass equinoctial ring dial, signed by Mahmud Bey al-Falaki, Egypt, dated 1291 AH/1874 AD

with outer meridian ring with suspension bow, engraved 90-0-90 in Arabic numerals and signed and dated, the equinoctial ring engraved with 1-12 hour scale, repeated on the edge of the bridge, with a pin hole sliding against Gregorian months written in nasta'liq on one side and zodiacal and declination scales on other

19cm. diam.