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Take a look at this post by Zak, good pix of the variations in ivory, + text to boot.

http://straightrazorpalace.com/razors/95259-how-tell-bone-ivory-4.html#post1120209

The whole thread is good...

The close up pix look like ivory to me. If there are no little divots on the ends, I think they are for blood circulation ? ...... then it is ivory, not bone. If the divots are there, it is bone....