A FRENCH PERPETUAL DAY/DATE BLACK MARBLE MANTEL CLOCK, c.1870, the twin barrel movement striking

A FRENCH PERPETUAL DAY/DATE BLACK MARBLE MANTEL CLOCK, c.1870, the twin barrel movement striking on a bell, the back plate stamped 1689, visible mercury compensated pendulum, 6 1/4" two piece white enamel dial with exposed Brocot movement and Roman numerals, the two subsidiary dials indicating the day, day of the week and mouth, with rolling moon lunar calendar and aneroid barometer, the upswept arched case inset with green marble and incised with scrolling foliage, glazed pendulum panel, raised on moulded oblong plinth, 20 1/4" high, 20 3/4" wide