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Yup, that's the guy. I haven't bought mammoth, but I do know when I ordered my walrus tusk I inquired about both walrus and Mammoth. Walrus was cheaper.

I'm not sure you can be real fussy about...

Who did you contact Hart? Gary from Canadianivory.com? I know he has mammoth ivory slabs, but I thought they were around 2" wide. At least good enough for two, maybe three razors.