That's interesting Jaeren, I wonder if they went brown with age? Also I Wonder if he dug them out of a lick or if they were just found in old estate sales.
The wood buffalo is a separate species, but will have to look it up. I can also ask a mate as he has some, come to think of it!
I have a few horns kicking about, but some are so knarly and thick with V heavy ribbing inside, that they would be a bears granddad to work on.
Have one half made I should finish though, but don't really like the fast taper when holding it.