After the success of the Panama-California Exposition from 1915-1917 in San Diego's Balboa Park, city planners sponsored another grand exposition to rejuvenate the city during the Great Depression. The 1935 California Pacific International Exposition, held in the same city park, was considered a success. The unusual and innovative exhibits and concessions are given credit for this. These included the "Lost Continent of Mu," and a sensational "nudist colony," where scantily-clad women drew a continuous audence. Traditional souvenirs included postcards and the usual small giveaway items. The donor's aunt attended and saved this printed copper greeting card as a memento of her visit. A thin sheet of copper bears an image of a San Diego Torrey Pine tree, and is marked for the exposition.