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Score another "duh" for me. I appreciate the education I get around here. I didn't realize how moldable a material tortoise is (was). This eBay article really nails it, very informative. Thanks.

I'm also inclined to think celluloid -- but what great work!

Carving bone or tortoise that way would be a huge labor of love -- just think what you would have to do to make that happen in bone...