Military and wartime antiques and memorabilia include an enormously wide variety of objects. From the battlefield, there are the uniforms, wristwatches, medals, buttons, and trench art worn, used, and created by those on the front lines. On the homefront, there are the war and propaganda posters produced to keep morale high in difficult times, the postcards mailed to and received by loved ones, and the memoirs and history books written during and after conflicts for the benefit of future generations. Picture-backed government-issued postal cards were produced in Austria-Hungary, and the images depicted the Franco-Prussian War. Nearly three million of these cards sold in 1870. The popularity of postcards began to decline during World War I. At the time, many American companies had designed their own postcards, but they had been shipped to Germany or Austria for high-quality and low-cost printing. Even English publishers, like Raphael Tuck and Sons, had their cards printed in Germany or Austria. Thus the Great War, beginning in 1914, disrupted the production of cards. Plus, the somber mood created by the conflict made postcards seem like disrespectful frivolities. In 1918, the postage rates for postcards doubled, and after the war, telephones became the preferred means for staying in touch.