Watch 1929: The Great Crash for Free: How to Stream the Movie Online at 123Movies. . A documentary exploring the causes of the 1929 Wall Street Crash.Over six terrifying, desperate days in October 1929, shares crashed by a third on the New York Stock Exchange. More than $25 billion in individual wealth was lost. Later, three thousand banks failed, taking people's savings with them. Surviving eyewitnesses describe the biggest financial catastrophe in history.