Swiss 18K gold open faced cylinder pendant watch Circa 1830

Gold pendant watch with an oval portrait 
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A fine, rare and thin Swiss 18K gold pendant watch with a painted portrait of a young lady, circa 1830. The back is engraved with foliate decoration and set with a painted portrait of a lady. Matte silver dial with champlevé radial Roman numerals, outer minute track and gold Breguet hands. Movement chased and engraved with foliate scrolls, Bagnolet calibre, eight jewels, cylinder escapement, three-arm brass balance, index regulator on the edge.
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Diameter: 44 mm
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Signed: No name