A late 19th Century black slate and variegated marble Mantel Clock, the broken architectural pedi

A late 19th Century black slate and variegated marble Mantel Clock, the broken architectural pediment over fluted columns and raised on plinth base to a cast brass bezel with heavy bevelled glass, enclosing a 5” Roman chapter ring, centring a visible brocot escapement with blued steel moon hands, to a circular brass movement with strike on a coiled gong, height 16 ½”