Antique Ansonia Mantel Clock. Founded in 1850, Ansonia was a prolific American Clock Manufacturer that peaked around 1914 before selling to a Russia company in 1929. This clock which was made in the 1880s is set in Green Onyx stone with a classical vaulted top and gilt bronze accents. The face is gilt with roman numerals and escapement along the outside. The perfect color that will add grandeur to any space.