Black Slate cased French Mantle Clock with multi-colored marble inserts. Retailed by J.E. Caldwell’s Jewelers in Philadelphia PA, Circa 1880. French eight-day time and strike movement bears stamp, “J.E. Caldwell Co. Philadelphia”. Caldwell was a premier jeweler of the late 19th & early 20th centuries, many consider them to be equal in prestige to Tiffany Co. in New York City.