Native American bison horn club

[Jens Nordlunde]

When visiting the western part of Canada some years ago, a friend living out in the country showed me one like it, and asked if I knew what it was.
I did not, but I took a few pictures - attached.
When I came back I asked on the forum what it was, and someone of the old members knew what it was. A kind of a war hammer if I remember correctly. He also sain that at a museum in Canada there was another one, which had belonged to Sittlng Bull(?) when he lived in Canada.