A late 19th Century black slate and variegated marble Mantel Clock, the architectural case with c

A late 19th Century black slate and variegated marble Mantel Clock, the architectural case with cast brass bezel enclosing a 3 ¾” Roman enamel chapter ring (hairlines), and signed to the centre with visible Brocot type escapement, to an Ansonia spring driven movement with anchor escapement, strike on a coiled gong, height 13”