Struck in 90% silver at the Denver Mint, the 1929-D 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-D silver dime is a prized and historic memento.