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There is also an elliot dutch rattler but I don't have a photo handy

Usually you see them in various stages of height loss up front because they are actually quite finely ground at the edge and above so they aren't as forgiving of knocks as wedges

Yes, that is the correct shape

It's the only one I have seen that has the full original profile intact. A lot of these you see left more at an 8/8 or 8/8+. My best guess is since it is actually quite finely ground at the business...