Quoting the Musée de l'Armée's description (first row, third from left) of the armor:
The Armour of the Dauphin was made for Henry of Orléans, who was King of France under the name Henry II from 1547 to 1559. In fact, it is decorated with dolphins ("dauphins" in French) facing each other (visual 3). This armour is 1.79 m tall and weighs 19.7 kg. The weight tells us that it was intended for military use. The material used is blackened iron which has been damascened (inlaid with silver). Until 1797, this masterpiece was kept in the royal collections in the Garde-Meuble de la Couronne.