An easy way to get immediate answers as to whether you have a doubled die, RPM, or OMM. Find them all listed here: www.varietyvista.com
Scroll down, find the e-book for the coin you are looking for and take the links.
If yours is not listed then you probably have non-collectable doubling such as Machine Doubling or Die Deterioration Doubling (search these topics on this forum and at error-ref.com).
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