I used to have a book on Native Americans in which there was a VERY old Tlingit club with concentric circles on it. (Actually, come to think of it, the book you list might just be the one?) The circles appeared perfectly round and I was intrigued that they could produce such a pattern. Perhaps we need to consider the material (porous whalebone) first. I mean, it's not like carving into granite. The whalers were able to make amazing shapes/scrimshaw with the most rudimentory of tools, so I imagine its possible. In any case, a very beautiful and amazing find, Ron!
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