Early Swiss 18k rose gold open faced lever watch Circa 1880

Rose gold ankerchronometer by Patek Philippe
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An early Swiss 18 carat rose gold open faced lever pocket watch, circa 1880. Fine ankerchronometer movement with large balance, wolf’s toothing and moustache lever.
White enamel dial with Arabic numerals and blued steel hands. Plain case. Dial and movement signed, case and movement with matching numbers.
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Diameter: 46.5 mm
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Weight: 75 g
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Signed: Patek, Philippe & Cie Genève
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Pocket watches in the small size of 46.5 mm are very rarely equipped with an ankerchronometer.