Swiss silver dual time zone centre seconds lever Circa 1860

Silver deck watch
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An early, technically complicated Swiss silver open faced lever deck watch with two time zones and independent, stoppable centre seconds, circa 1860. High-quality bridge movement with sapphires, temperature compensation and parachute, two barrels for the movement and independent second, lever movement. White enamel dial. Heavy plain case. Case numbered, maker’s mark MB.
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Diameter: 57 mm
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Weight: 156 g
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Signed: No name