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.

In 2013, the artist's proof of the block sheet dedicated to Real Monasterio de San Lorenzo de El Escorial, a UNESCO World Heritage Site, was issued. The circular stamp which comes with the issue shows a reproduction of the obverse of a €2 commemorative coin dedicated to the Real Monasterio.

The proof reproduces a panoramic view of the site of historical monuments while the stamp shows a reproduction of the commemorative coin dedicated to the Real Monasterio.

The block sheet belonging to this issue shows a reproduction of a panoramic view of the site of historical monuments while the stamp is illustrated with a reproduction of the commemorative coin dedicated to the Real Monasterio.