A complete 1957 commemorative set from Ecuador, honoring the five American missionaries—Ed McCully, Jim Elliot, Roger Youderian, Nate Saint, and Pete Fleming—who served in the Ecuadorian Oriente. Each stamp pairs the portrait of a missionary with native Amazonian wildlife, including the squirrel, armadillo, brocket deer, Amazon River landscape, and sloth. Vibrant thematic designs and symbolic forest motifs make this set highly sought after by collectors of Latin American history, missionary themes, and wildlife topicals. A compelling issue combining cultural tribute, natural heritage, and mid-century Ecuadorian design.