Struck in 90% silver at the Philadelphia Mint, the 1929 Mercury dime was produced during an eventful year in American history. The Roaring Twenties, which brought great social, artistic and cultural change to the nation, were coming to a close. October 24, 1929, would become known as Black Thursday, when the stock market crashed and the euphoric stock buying spree of the `20s finally ended. The 1929 silver dime is a prized and historic memento.