Very early Swiss 18K gold open faced lever watch Circa 1868

Gold lever pocket watch by Patek Philippe
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An interesting, very early Swiss 18 carat gold open faced lever pocket watch, circa 1868. Made for Palmer Bachelders & Co, Boston, USA. Very rare bar movement with key winding, large balance with gold screws, moustache lever escapement. White enamel dial with Roman hours and outer minute divisions, subsidiary seconds, steel filigree Breguet hands. Engine-turned case, reeded band. Case numbered, cuvette signed and numbered.
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Diameter: 47 mm
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Weight: 82 g
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Signed: Patek, Philippe & Co Geneva