Early Swiss gold, enamel and stone-set verge watch Circa 1770

Gold, enamel and stone-set verge in pair cases
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A very rare Swiss gold, enamel and stone-set pair-cased verge pocket watch, circa 1770. Early verge movement, worm gear.
White enamel dial with R0man hours and Arabic minutes, original stone-set hands. Engraved case, the back with the polychrome enamel portrait of a lady, both sides stone-set. Dial signed, movement signed and numbered, case and movement with matching numbers.
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Diameter: 38 mm
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Weight: 59 g
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Signed: Bordier A Genève
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Bordier a Geneva watchmaker’s family listed around 1630.
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Verge watch from this period in such nice original condition is very rare.