Magnify the picture of the edge. It might be a JPG artifact, or a 2mm crack. Actually, two of them.
Printable View
Tape the blade with satin finish scotch tape.( makes it easier to see over clear tape) then carefully trim around the gold, leaving just a little around the perimeter with a razor blade. Then wrap a piece of rag around the eraser end of a "NEW" #2 pencil and use flitz or Maas.
Won't normally lift the tape, but still be careful around the edge of the tape. Might not come out perfect, but will look alot better.
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