In addition to printing philatelic products, FNMT-RCM joins forces with Correos (the Spanish Post Office) in the issuance of combined series of collector coins and stamps.

On this occasion, two products dedicated to the Altamira Cave are launched.

Situated in the municipal area of Santillana del Mar (Cantabria), the Altamira Cave was the first place in the world where the existence of cave art during the Upper Palaeolithic was identified.

The cave is best known for its polychrome ceiling, with figures of huge horses in red, bison, deer and bulls. Natural pigments were used in the paintings: reds and browns were obtained from iron oxide while black was obtained from coal.