Old rare Green Onyx clock, brass feet and ornaments, late 19th century

Old clock in rare green onyx (not marble), brass feet and ornaments, late 19th century napoleon iii, vincenti jean clock, silver medal 1855, so-called paris mechanism n°3255, pendulum n°3255, bouet dial with white enamelled chaumont decorates flowers. Clock and striker work perfectly, bronze bell, beautiful ringing tone. With key. The upper plate is slightly damaged on the right. Missing an onyx plaque on the top and decorates the top of the right column, not original. Onyx is very fragile. Dimensions 26cm X 15cm, height 48cm.