This paper provides a reconstruction of the yearly values of Mexico's foreign trade within the period 1870–1929, the era of liberal capitalism. It uses the Mexican official statistics as well as those published by Mexico's main trading partners: the United States, Great Britain, France, and Germany. The article assesses de quality and consistency of the Mexican sources and applies explicit criteria to rectify the official figures and to fill the gaps in the available information. It also proposes a new breakdown of trade values, which allows distinguishing between commodity trade and specie movements. As a result, the article provides widi complete annual series of commodity trade and specie flows, as well as a yearly estimate of the trade balance throughout the period.