Sorry, but its flat with no evidence of split serifs. All characteristics of mechanical doubling, which isn't considered an error and adds no value.
The following sites have a comprehensive listing of doubled dies. If you feel it isn't mechanical doubling, you can search for an exact match https://www.doubleddie.com http://varietyvista.com The following tab on Wexlers site gives a good explanation of non value added doubling such as die deterioration and mechanical. https://www.doubleddie.com/144801.html
Your coin looks like a proof. Which helps giving credence to mechanical doubling as proofs are pressed/struck twice.
