Swiss 18K gold open faced ankerchronometer Circa 1877

Gold lever watch by Patek Philippe
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A Swiss 18 carat gold open faced ankerchronometer, circa 1877. Ankerchronometer movement, solid gold wheels, winding wheels with wolf’s toothing, moustache lever in a special design, ankerchronometer balance. White enamel dial with Roman hours and Arabic minutes, subsidiary seconds, blued steel hands. Plain case, monogram on the back. Case and movement numbered, cuvette signed and numbered, case and movement with matching numbers.
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Diameter: 51.5 mm
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Weight: 120 g
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Signed: Patek, Philipe & Co Genève