Set of three books: -AA. VVV., Enciclopedia de la plata española y virreinal Americana, Edición de los autores, Madrid, Madrid, 1984. -BLAIR. C., The history of silver, Ballantine Books, 1987. -ANGULO IÑIGUEZ. D., Catalogo de las alhajas del del delfín. Editorial Museo Nacional del Prado, Madrid, 1989. Sizes: 33 x 25 x 4.5 cm; 30 X 23.5 X 2.5 cm; 26 X 23 X 2.5 cm. Set of three books specialising in different artistic disciplines. The books belong to the personal collection of Don Juan José Ontalva (Chinchón, 1930- Madrid, 2019), a famous watchmaker from Madrid, descendant of several family generations dedicated to the world of watches. During his career he achieved a high degree of precision and skill, becoming the master of other watchmakers. He is currently recognised for numerous works, including the commissioning and restoration of the Billeter astronomical clock, located in the Congress of Deputies.