A very thin mid 19th Century Bagnolet calibre cylinder in a gold and enamel case. Unusual Bagnolet calibre keywind gilt movement profusely engraved on both sides. The train inverted and visible within the ring dial. Engraved suspended going barrel wound with a male key. Engraved cock with gilt geared regulator set by key from the back, plain three arm gold balance with blue steel spiral hairspring. Polished steel cylinder, steel escape wheel. Silvered ring dial with Roman numerals, blue steel Breguet hands. Very slim gold open face case of only chased front bezel and engine turned back decorated with a polychrome floral scene. Gilt key with male square to wind, set and adjust the watch.