Gold and Enamel Cylinder

A 19^th Century Swiss cylinder in a gold and enamel open face case.  Keywind gilt Lepine calibre movement with suspended going barrel. Plain cock with polished steel regulator, plain three arm gilt balance with blue steel spiral hairspring. Polished steel cylinder, steel escape wheel.   White enamel dial with subsidiary seconds, Roman numerals, blue steel Breguet hands. Engraved 18 carat open face case, the back with a cartouche of translucent dark blue enamel over an engine turned ground, gilt floral decoration.  Wound and set through the signed engine turned gold cuvette, maker's mark "FD" in an oval.