Swiss 18k gold and enamel butterfly form watch Circa 1810

Form watch with enamel butterflies to both sides
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A Swiss 18 carat gold en enamel hunting cased butterfly form pendant watch, circa 1810. Case to both sides enamelled with multi coloured butterflies, feeler set with miniature pearls, opening button at the lower rim, inside the concealed watch with miniature verge movement. White enamel dial with Roman numerals and filigree steel Breguet hands.
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Dimension: 35 x 39 mm
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Weight: 23 g
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Signed: No name
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Only nine other comparable pieces are known, four of them are originally part of the famous Sandberg collection.