These are picture postcards from around 1910. These were color-tinted by the original postcard manufacturer at that time. Carte de visite's were replaced by picture postcards and could be mailed or simply collected in albums, which the Victorians loved. Makers found that black and white images could be easily tinted into color and these were produced in great quantities from the very start. There were many cards that show tourist spots, hotels, animals, world's fairs, or interesting people (like "The Great Sandow"). These color-tinted cards were the standard from around 1900, well into the late 1940's. Sandow wears leopard skin shorts in this photograph. Leopard skins were a common symbol of "strength" used in great paintings of the 15th through 19th centuries.