Lot of four books: -COLLARD. F.B.R., British skeleton clock. Enlarged ed. Robert Hale Ltd, 1977. -COLLARD. F.B.R., Skeleton clock. E. N A G Press Ltd, London, 1977. -PLOMP, R., Spring -driver Dutch pendulum Cloks 1657-1710. Ed Interbook International, 1979. -ORD-HUME. A., The Musical Clock: Musical and Automaton Clocks and Watches. Mayflield books, 1995. Sizes: 28.5 x 25 x 2 cm; 28.5 x 25 x 3 cm; 28 x 22 x 2 cm, 25 x 20 x 3 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 Congreso de los Diputados (Congress of Deputies).