Iroquois Deer-Antler War Club, 19th Century.

This type of war club was commonly used. In the lower edge, a sharp-pointed deer's antler, about four inches in length, was inserted to create a dangerous weapon that would inflict a deep wound in close combat.
Courtesy of The New York State Museum: The University Of the State of New York close window
citation: http://www.hawthorneinsalem.org/images/fullpageimage.php?name=MMD2445