In my humble opinion, for ED to be in place there has to be visible damage to the surface of the coin. I don't see any evidence of that on this coin. There is only a difference in the color of the coin. For a copper coin, which is the most reactive of the metals typically used for coinage, the presence of chemical elements and compounds in the environment will react with the surface of the metal and may tone it in many different colors. The toning in this example looks very natural and not artificial. And I personally find it stunningly attractive.

IN NECESSARIIS UNITAS - IN DUBIIS LIBERTAS - IN OMNIBUS CARITAS
THE MAN IN THE ARENA, Theodore Roosevelt at the Sorbonne Paris on April 23, 1910: "
It is not the critic who counts; not the man who points out how the strong man stumbles or where the doer of deeds could have done better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood, who strives valiantly, who errs and comes up short again and again, because there is no effort without error or shortcoming, but who knows the great enthusiasms, the great devotions, who spends himself in a worthy cause; who, at the best, knows, in the end, the triumph of high achievement, and who, at the worst, if he fails, at least he fails while daring greatly, so that his place shall never be with those cold and timid souls who knew neither victory nor defeat."
My coin website:
https://fairfaxcoins.com