Swiss ornamental gold and enamel verge watch Circa 1790

Gold and enamel ornamental verge by Blanc Frères
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A Swiss ornamental 18K gold and enamel open faced verge pocket watch, circa 1790.
The case back engine-turned overlaid with dark blue translucent enamel, floral paillon borders. White enamel dial framed by a two-colour gold rim, radial Arabic numerals and gold beetle & poker hands.
Full plate movement, chain/fusee, verge escapement, three-arm brass balance. Dial numbered, movement signed and numbered.
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Diameter: 54 mm
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Weight: 91 g
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Signed: Blanc Frères à Genève
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This is a very fine timepiece in remarkably good condition it equals the work of William Anthony, London, in quality and design.