Swiss 18K gold open faced ankerchronometer Circa 1883

Gold ankerchronometer by Patek Philippe
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A very rare Swiss 18 carat gold open faced ankerchronometer pocket watch, circa 1883. Ankerchronometer movement, very large chronometer balance, unusual main plate, very long regulator pointer, very rare Patek Philippe calibre. White enamel dial with Roman hours and Arabic five minutes, subsidiary seconds, rose gold hands. Plain case, monogram on the back. Case and movement numbered, cuvette signed and numbered, dial signed, case and movement with matching numbers.
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Diameter: 48 mm
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Weight: 85 g
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Signed: Patek, Philippe & Cie Genève