Swiss gunmetal lever with world time indications Circa 1910

Gunmetal world time watch
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A Swiss lever with world time indications in a gunmetal open face case, circa 1910. Gilt three quarter plate keyless movement with going barrel. Plain cock with polished steel regulator, uncut bi metallic balance with spiral hairspring. Club foot lever escapement. Unusual white enamel dial, the outer ring of  Roman numerals with a finely divided chapter at its inner edge. The enamel center of the dial rotates with the hour hand and is marked with major cities around the world, those marked in red being behind Greenwich. Blue steel hands, the hour hand to be set by the watchmaker to the owner’s time zone. Plain open faced case with clip on back and bezel, gilt winding button and bow.
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Diameter: 48 mm
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Signed: Buren
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In excellent condition. The Buren Watch Company was created in 1898 by Fritz Suter und Cievby the London company of H. Williamson Ltd.