Possibly Jean Cousin the Elder, ‘Armor of Henry II, King of France (reigned 1547–59)’, ca. 1555, The Metropolitan Museum of Art

French, possibly Paris; Wt. 53 lb. 4 oz. (24.20 kg)
http://www.metmuseum.org/art/collection/search/24671

Image rights: The Metropolitan Museum of Art (Harris Brisbane Dick Fund, 1939), licensed under CC0 1.0 Universal