French one handed verge pocket watch “Oignon” Circa 1680

Open faced pocket watch by Piquet 
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A French decorative single-handed verge pocket watch “Oignon” with central winding, circa 1680.
Brass, firegilt dial with engraved foliate decor and large lateral hinge. Gilt champlevé dial with enamel cartouches, blue radial Roman numerals, enamelled minute ring, the centre finely chased and engraved with a pair of birds, a fruit basket and ribbon decoration and single iron hand. Fine full plate movement, keywind, firegilt, signed, chain/fusee, Egyptian movement pillars, applied blued iron click work, verge escapement, three-arm iron balance, large florally engraved and pierced balance bridge.
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Diameter: 57 mm
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Weight: 148 g
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Signed: Piquet à Rennes