A French Napoleon III gilt brass and marble four-glass striking mantel regulator with perpetual calendar, A. Brocot & Deletterez, circa 1860

13-cm enamel ring for sweep seconds enclosing a susidiary for hours and minutes with Breguet hands, recessed centre with visible Brocot escapement, two-piece enamel subsidiary below with outer ring for month and equation of time and the centre with dials for date and day, aperture for moonphase with polychrome surround, the whole set in a finely foliate engraved gilt mask, rack bell striking movement signed A.Brocot & Delettrez Paris 8174 with connection to the calendar mechanism below, pendulum with Ellicott-type compensation, gilt brass four-glass case with bevelled panels, moulded white marble top and base