Thanks, Nestin and Trojan!
This is the smaller partner of the Canon Court de 105 mm, the mountain gun Canon de Montagne de 75 mm Schneider Mle. 1919. Bought by several countries in the 1920s, among them, Peru. The first one is depicted as it appeared during the short lived war between Peru and Ecuador in July 1941, with modified shield and wooden wheels. The second one is a drawing of a gun with the modified shield and pneumatic tires, as it's shown at the Army's Museum at Real Felipe Castle, Callao, in the first half of the 1990s.