im no error expert, but that looks like PMD to me, notice how the edge of the "clip" extends past the rim (obverse) at the 5th star, if it was an actual clip, I dont believe ANY metal would extend past the rim, also note the flat spot opposite the clip, see how it dirupts the denticles under the date ? the seller seems quite convinced that it is a legitimate clip, if you have any interest in buying it, I would ask the seller if he would stand behind it if you submit it to a service, I would recommend ANACS



















