French gold lever watch with independent seconds Circa 1880

Gold repeating independent centre-seconds lever
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A very fine and very rare, heavy French 18-carat gold open-faced two-train keyless lever pocket watch with independent centre seconds, circa 1880. Gilt Movement, jewelled, two-train with tandem winding, lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring. Gold-hinged cuvette.
White enamel dial with Roman numerals, outer black Arabic five-minute numerals, and gold spade hands. Polished case, button at 11 for the hand-setting. Signed dial, case (with initials) and Movement.
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Diameter: 52.5 mm
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Signed: LeRoy & Fils
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LeRoy & Fils. Paris (Palais Royal) 1830s-c.l910, then Paris (Avenue Opera) 1940s, London (Regent Street, later New Bond Street, at one time Maddox Street) as Leroy & Son 1850s-90s To H. M. The King’.