Lot comprising four books: -Musei e Gallerie di Milano Museo Poldi Pezzoli Orologi Oreficerie. Electa editrice, 1981. -SIMONI, A., Orologi italiani dal cinquecento all`ottocento. Ed. Vallardi, Milano, 1980. -AA.VV., Ore d`oro. Orologi da polso: passione e investimento. Ed. Wrist, Milan, 1984. -BRUSA, G., Lárte dell Orologeria in Europa. Publisher: Bramante Milano 1978. Sizes: 32 x 27 x 4 cm; 30 x 22 x 2 x 2 cm; 25 x 25 x 3 x 3 cm; 28 x 22 x 2 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.