French silver pierced and engraved verge watch Circa 1680

A French silver verge pocket watch, circa 1680. Gilt full plate movement, pierced and engraved balance cock, worm and wheel set-up, plain two-arm balance. White enamel dial with half hour divisions and later single hand. Case back finely pierced and engraved with a floral design. Movement signed ‘Alexandre Plan’.
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Diameter: 36 mm
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Signed: Alexandre Plan