Lever watch with world time dial in gunmetal case Circa 1910

Gunmetal world time watch
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A Swiss lever with world time dial in a gunmetal open face case, circa 1910. Gilt three quarter plate keyless movement with going barrel. Engraved cock with polished steel regulator, uncut bi metallic balance with spiral hairspring. Club foot lever escapement. White enamel ring dial with Roman numerals, markings at its inner edge for quarters and five minutes and blue steel hands. Within this an enamel disc rotates once every twelve hours. Cities around the world are marked in black and red to indicate the time in different locations, the hour hand always showing local time. Plain gunmetal open faced case with clip on back, gilt winding button and bow.
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Diameter: 48 mm
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Signed: Buren