 The program was headed by major Félix Verdeja Bardales and led to the development of four prototype vehicles, including a self-propelled howitzer armed with a 75 millimeter (3 in) gun. It was designed as an advanced light tank and was one of the first development programs which took into account survivability of the crew as opposed to the protection of the tank itself. The tank was influenced by several of the light tanks which it was intended to replace, including the Panzer I and T-26, both of which were originally used during the Spanish Civil War. The Verdeja was considered a superior tank to the T-26 after a lengthy testing period, yet was never put into mass production.
