This was a handcrafted tank built by local initiative early in Constancio Rámiz workshop, in the Aragonese town where it took the name from. Huge in size for its intended light tank role, poorly armed, even more poorly armored, some four of them were built using a variety of recycled/salvaged materials; tracks were taken from agricultural tractors, engines came from old Ford commercial trucks, while hulls were made from scrap metal. The vehicle was given a coat of grey paint to make the scrap metal look homogeneous.
There is no actual record of them being used in combat, and their ultimate fate is unknown. They were all likely scrapped before the war’s end.