Swiss. An unusual 18K pink gold openface semi-skeletonized quarter repeating cylinder watch with visible balance and regulator

Swiss. An unusual 18K pink gold openface semi-skeletonized quarter repeating cylinder watch with visible balance and regulator
Unsigned, no. 779, circa 1820
Mechanical cylinder movement, finely pierced and engraved bridges, repeating on two steel hammers, small dial with Breguet numerals on white enamel chapter ring, skeletonized centre with star-shaped decoration, aperture revealing the balance and the regulator, finely floral and scroll engraved gold plate, circular case, ribbed band, repeating through the pendant, case stamped H&I and numbered 779
58 mm. diam.