I am undertaking a research project and I am searching for attributed examples of Master Die Doubling. Can anyone help me by providing links? My primary target range is 2004 to current. I am aware of examples on the 2022 American Women Quarters Series and on a 2023 Nickel. Are there any other examples? I would also be interested in examples from 1980 through 2003. (By the way: I have been searching!) Any help appreciated!