When three coins are squashed together, the design can be transferred to another coin. The raised areas are pressed into the center coin. Usually done with a vise. (full transfer)

On your coin may have been don with two coins and two pieces of wood and hit with a hammer, the one coin damaged the other one. (partial transfer.)
The way you can tell is that the devices are pressed into the coin and mirrored. If a die had done this, the devices would be raised and normal (not mirrored).
Here is a coin that was double struck:



Another one:

This one was struck once on center and once out of collar. Note still that the devices are normal in appearance on both strikes, not mirrored/raised because it was done at the mint. Also note that the rim on the second strike is not present. This is correct. When coins are fake/atered strikes, the rim area is also transferred when they should not be there. Also they should have both dies featured on both sides if this happened from the mint with a double strike.
Edited by coop
02/12/2015 11:37 am