Extremely rare Swiss gold seconde morte lever Circa 1851

Gold open faced lever watch with seconde morte
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An extremely rare Swiss 18 carat gold open faced seconde morte lever pocket watch, circa 1851. Movement with key winding and lever escapement, bridge signed, later detachable winding wheels for manual winding. White enamel dial with Roman numerals and steel Breguet hands, signed at the rim. À goutte case, engine turned, monogrammed, coin rim. Cuvette signed and numbered, engraved: echappement a ancre trois levées et 14 trous en rubis balancier compensé Patek Philippe Genève Aiguilles.
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Diameter: 45 mm
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Weight: 66 g
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Signed: Patek, Philippe & Co a Genève
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Technical Patek Philippe rarity.