This is antique, 19th century, Victorian era, Civil War era American mantle clock that was produced in Boston, Massachusetts by Shreve, Stanwood & Company which was active under this name from 1860 - 1869. The base is actually a black slate marble, not metal and it is weighted (the 'cement' filling). The cast metal figural atop, possibly imported by Shreve-Stanwood from France, is a depiction of a Classical Greek Scholar, likely Pythagoras. The estimate is based on actual recent past recorded auction sales of comparables.