French gold open faced lever chronometer watch Circa 1890

Gold open faced pocket watch by France Chastant
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A French lever chronometer in practically new condition, circa 1890. Most probably a graduate’s piece of the watchmaking school in Besançon.
The engine-turned case is 18-carat pink gold. The dial is white enamel, signed, has Roman hours, Arabic minutes, a subsidiary dial for the seconds and gold Louis XV hands. It has a bridge movement, ébauche: LeCoultre, gold screw compensation balance with gold and platinum regulation screws, and a helical Palladium balance spring.
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Diameter: 46 mm
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Weight: 82 g
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Signed: France Chastant, Valence
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French watch manufacturer France & Chastant had their premises at Rue Neuve 12 in Valence in France. The business included the retail of watches and clocks and their repair and the sale of electrical instruments. The clocks and watches were signed “France Chastant à Valence”.