This is one of three known U.S. $5 Liberty Gold pieces struck off-center. One was struck approximately 5% off-center and the other was struck a full 10% off-center.
This dramatic $5 Liberty was struck at least 10% off-center. As the coin was struck, the pressure from the dies forced the blank to expand in size since it was struck out of the collar. It is also an overdate from the San Francisco Mint which makes this a rare and unusual combination of mint errors. This is one of the most spectacular U.S. Gold major mint errors known.