The portrait of Magellan was examined by conservator Sheldon Keck of The Brooklyn Museum by radiography, microscopy and ultra-violet light. He stated in a letter dated May 14, 1947 to Harry Stone that "no technical evidence was revealed to indicate that it [the painting] was not of the late 16th century or early 17th centuries. It is my opinion that the painting is of this period". In a letter dated May 26, 1948 dealer Harry Stone indicated that he has shown the portrait to "a number of men qualified to judge the age, and they have definitely reported that the portrait was painted during the 16th century". On February 12, 1979 Mr. Richard Wonder from Christie's New York visited the Museum and he indicated that he thought the Magellan portrait might be a copy of an extant portrait and not done from life, but he did not express any opinion of the probably age of the painting. In 1981 curator John Sands spotted a similar portrait in the Torre del Oro maritime museum in Seville, Spain. He also saw a replica painting in the Marine Museum at Lisbon. He contacted the Museo Naval in Madrid after his return and received a photograph of the portrait in the Torre del Oro. The portrait is remarkably similar to our painting.