Money changer`s balance; circa 1500. Iron and bronze. The weights have yoke stamps and dates. Measurements: 3 x 18 x 9 cm. Precision balance with two pans, made in different metals. The piece has a wooden case, in which there is a drawer containing a piece of wood to place the weights with different emblems. This piece belongs 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).