Not the best photographs, but I made a pair of Maquahuitls using 5 million year old fossil shark teeth.
One is made from Tiger & Bull shark teeth and on the other Requiem shark teeth are used. All teeth were found in North Carolina.
With the abundance of fossil shark teeth exposures in the Mid-Atlantic, I wonder if shark teeth were ever used as parts of war clubs in this area.
I've seen pictures of local fossil Mako teeth modified to be better hafted to spears, or unto heavy atlatl darts.
And it looks like they were used in war clubs as close as the Gulf Coast and Keys of Florida (figure 5).