1939 Planes and landscapes set of two imperforated stamps are relatively modern rarity of Spanish philately. These stamps was prepared for issuance but never released. Only five examples from this interesting series without gum were introduced into postal use, each with bottom sheet margin. 1939 Planes and landscapes stamps are one of the most notable Spanish issues, as only 50 specimens were printed. The set of two 1939 Planes and landscapes imperforated stamps were auctioned by Cherrystone in March, 2013. The lot, with 2004 Comex certificate, fetched a record price of $17,250.