Swiss gold/silver pair watches with micro mosaics Circa 1820

Set gold/silver open faced watches 
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A pair of unusual gold and silver open faced watches with micro mosaics, circa 1820. Both: gilt full plate movement, visible balance wheel and regulator, engraved mainspring barrel and balance cock, both: white enamel dial, Arabic numerals, inner track for 1/12 hour divisions, single hand, with hairlines, both: polychrome micro mosaics depicting bridges over a river with medieval structures, movements signed Breguet. 
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Diameter: 63 mm
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Signed:  Breguet  Swiss
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Property of a distinguished collector