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The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula in the southern constellation Musca about 8,000 light-years from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924).
The round hammered brass clock face has Arabic numbers, stamped spherical detail denoting the minutes, a repousse floral ring and darkened metal filigree minute and hour hands. The clock strikes on the quarter hours and announces the hour with a Westminster chime. The pendulum, chains and triple weights have brass detail. An applied brass plaque to the interior of the door denotes the Colonial Manufacturing Company of Zeeland, Michigan as the manufacturer.