French gold open faced ankerchronometer watch Circa 1870

Pocket watch by Frédéric Rötig
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A French 18 carat gold open faced (probably deck) chronometer, circa 1870. Ankerchronometer movement, gold wheels, wolf’s toothing.
White enamel dial with Roman numerals, rose gold hands and subsidiary seconds. Comes with the original box. Engine turned à goutte case, reeded, enamelled monogram to the back. Cuvette signed and numbered, case numbered and dial signed.
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Diameter: 49 mm
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Weight: 85 g
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Signed: F. Rötig Havre