2021 D Lincoln Shield Cent-New DDR?

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For a strong example, look at the 2004-P DDO Peace Medal nickel.

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CLASS IX - SHIFTED HUB DOUBLING:
"This form of doubling happens when a slightly misaligned (tilted) die "pops" into position under the constant pressure of the hub and its thousands of pounds of force." ¹

"It is most often characterized by a slippage of the design, in a cardinal direction - much like the Class IV offset hub doubling. It most often affects centrally located design elements. The main difference, with respect to causation, is that the design is never "picked up" off the die during the hubbing. Rather, it suddenly "slides" into place creating doubling in the design." ¹

Once more there are some differences of opinions among the variety experts. John Wexler writes," Class IX. God Only Knows - This class of doubling is for those doubled dies that are simply unexplained. It is for those extremely few doubled dies that defy logic and common sense. It is where the physical evidence does not support a reasonable conclusion on how the working die was hubbed to produce the secondary image."

Those files that have the Class IX use it for listings of doubled dies that were made by the single squeeze hubbing system. However, this presents a problem for there is a grey area when the U.S. Mint used both the single squeeze and multiple hubbings to make dies. This transitional period extends from before 1986 (the first year that the U.S. Mint reported using the single squeeze hubbing system) to 1997 (when the single-squeeze hubbing was finally and fully implemented at both the Denver and Philadelphia mints for all denominations). This time span contains a lot of doubled dies that cannot be confidently assigned to one or the other hubbing system.

Again, there are some listings in the Class IX doubled dies that contain files for trail dies(wavy steps). We feel that this is incorrect and that trail dies, including what is called wavy steps, are not doubled dies, but a different type of anomaly.