This 1974 Jefferson Nickel was double struck and rotated in the collar between strikes. It is still in the original 1974 Uncirculated Mint set.
We also have a similar mint error for sale that was featured in the book, 100 Greatest U.S. Error Coins. In 2010 the authors valued this unique mint error from $15,000 to $17,500.
Click for more info on this Jefferson Nickel dual date mint error.