French gold open faced watch with chronograph Circa 1875

Gold chronometer pocket watch
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A precision French open faced pocket watch with chronograph, circa 1875.
An 18-carat rose gold case with numbered and signed gold dome. Signed enamel dial with Roman radial hours, auxiliary seconds, 30 min. counter, gold spade hands and centre chronograph hand. Bridge movement, frosted, gilt, finely ground, bevelled chronograph steel parts, wolfteeth winding wheels, gold screw compensation balance, blued balance spring, chronometer escapement.
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Diameter: 49 mm
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Weight: 98 g
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Signed:  Rötig Constr. de Chronomètres Le Havre