Unique Swiss silver and enamel pendant watch Circa 1687

Silver verge watch with enamel painting by Johann Anton Hegglin
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A unique Swiss silver pendant watch with the enamel painting Mary with the Jesus Child, circa 1687. Early verge movement with enamelled verge bridge and the finest enamel painting, a scene visible through glass insert in the case. Silver dial with Roman hours, an inner minute track and Arabic quarter-hours, extraordinary brass hands. An unusual case form, both sides set with jewels, among them also diamonds, emeralds and rubies. Comes with the, presumably, original key set with jewels. Movement signed.
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Diameter: 60 mm
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Signed: Johann Anton Hegglin Zug Switzerland
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This pendant watch is unique and extremely rare. It has been known for a long time.