CHT206283 Tour a Guilloche, belonging to Louis XVI (1754-93), made by I.T. Mercklein Saxon of the Garde-Meuble de la Couronne, Paris, 1780 (metal mounted on wood) by French School, (18th century); CNAM, Conservatoire National des Arts et Metiers, Paris; (add.info.: special machine used in obtaining special effects in enamelling; lock making was one of Louis XVI\'s hobbies; locksmith;); 穢 Archives Charmet; French, out of copyright.