Found this while searching through some change my gramma gave me to look through also. Its small but still pretty cool! Its weird under magnification, your eyes trick you and make it look like its above the coin surface, when its actually slightly below.
When the blanking dies get dull, they can shear the material incompletely (not the same as an incomplete punch), and the blank hangs momentarily from an unshared remnant of the parent stock before being pulled away, severing the blank in tension rather than shear, and leaving a sharp burr. That burr stands proud of the edge of the blank, much like an icicle hanging from the roof of a house in winter. When struck, the burr is impressed into the coin.
Oh wow thats cool. So it really is raised then, huh. Is the burr copper? Also is this cooler or not as cool as partial clad? (Im going to assume not as good, but still cool).
On clad coins the rim burr can include copper like the subject coin, but it doesn't necessarily have to. To me, "coolness" depends less on whether it is a partial clad error or a rim burr, and more on which coin is visually more impressive.
