Swiss watch with two time zones and centre seconds Circa 1860

Gold pocket watch by Dubois & Leroy
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A Swiss technically interesting, early observation watch with 2 time zones, independent stop second and flashing quarter of a second, circa 1860.
Polished 18K gold case, the middle part with coin edge, case hallmarks attributed to Dubois & Leroy, floral relief rim and the dome inscribed. Beautifully preserved enamel dial (very fine, old hairline crack), display of 2 time zones, persistent Central seconds, sustained flashing quarter seconds, seconds foudroyante, and Breguet steel hands. High-quality, early lever movement with 2 independent barrels, key winding.
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Diameter: 51 mm
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Weight: 96 g
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Signed: Dubois & LeRoy Le Locle