I think the last picture is the angle it was take from. I can't put a grade on it from the pictures - but it is a cool find.
I have had plenty of success with http://www.harlanjberk.com/. You can see pictures on their site. There are plenty of reputable sellers online....
Well I think you got the attribute right. I am not sure if I am imagining things or not, but I thought I saw the beginnings of the cracks. Now...
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