I have a nice, well used 3 3/16" Copena stemmed spear/knife tool found in Tennessee. The material is a tan brown colored chert stone. This blade is 13/16" wide. This artifact comes with a Certificate of Authenticity from Davis Authentication Services, dated 04/14/2020. The COA# 4258 can be seen in the 1st picture. As with all the artifacts I sell, I guarantee them to be 100% AUTHENTIC. I am a member of CSAS, MAS and ISAS.