It's not unusual to see denticles cut into the collar area, and Strike Doubling on them. Yours is a fairly extreme example, but a little extra pressure would both push the denticles in further, raise the edge a little more, and as a result make Strike Doubling more prominent. Although interesting and unusual, I don't think it "extraordinary" nor a sign of a counterfeit.
As regards grade, technically low AU but I fear it's been brushed, evidenced by the detail pics.
As regards grade, technically low AU but I fear it's been brushed, evidenced by the detail pics.


























