French Louis XV style mantel clock , circa 1860, the tortoiseshell effect case applied with brass

French Louis XV style mantel clock , circa 1860, the tortoiseshell effect case applied with brass leaf scrolls, the white enamel Roman dial (chipped), twin barrel movement with Brocot suspension, external countwheel striking the half on a bell, the back plate and dial signed Hy Marc a Paris . Height 24cm.