Swiss silver open faced Patek Philippe watch Circa 1877

Silver lever pocket watch 
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An extravagant, very early Patek Philippe Ankerchronometer with rare 2/3 main plate with extract of the archive, circa 1877. An original silver case, engine turned, reeded mid section, matching number on case movement and dial, dome signed and numbered, very rare and early Ankerchronometer movement with very large chronometer balance, very rare 2/3 main plate, decorated, enamel dial in perfect condition, blued steel hands, well-kept condition. The extract of the archive confirms the originality of the watch.
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Diameter: 50 mm
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Weight: 84 g
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Signed: Patek Philippe & Cie  Genéve
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Case with signs of usage and flat dents