An interesting French gilt brass four-glass striking mantel regulator with rare 'coupe perdu' system, last quarter 19th century

15-cm enamel dial with Roman numerals and skeletonized centre, shaped blued hands and sweep seconds, movement with a single spring barrel with double action and auxiliary spring for maintaining power, Brocot escapement with half seconds pendulum releasing the sweep seconds hand every other beat through a spring pallet fan mounted on the front plate, countwheel striking on a bell lacking hammer, moulded gilt brass case with bevelled glass panels