Set of four books: -CARRERA, R., Les heures de l`amour. - Hours of Love. - Die Stunden der Liebe. Lausanne, Scriptar, n.d. -CARDINAL, C., L`Horlogerie dans l`Histoire, les arts et les sciences - Chefs-d`oeuvre du Musée international d`horlogerie de La Chaux-De-Fonds - Suisse, Scriptar, Lausanne, 1983. -PATRIZZI, O., Montres de fantaisie: Watches of fantasy, 1790-1850. Galerie d`horlogerie ancienne, 1979 (TWO VOLUMES). Sizes: 30 x 30 x 1.5 cm; 27 x 21 x 2 cm; 24.5 x 18.5 x 2.5 cm. Set of four books specialising in watches. 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.