Clean freeze crack separation down the near center of the stone that is almost invisible when it lays in place due to being so dark.  Has beautiful natural striations in the slate and a very clean bore through hole.  Found in the Ohio/ Indiana Regions of the United States and likely 3,000-6,000 years old.

This handmade Ancient Black Slate 1 7/8" Prismodial Bannerstone is a Native American artifact from the pre-1600 period, originating from the United States. It comes with an Ownership History Available, suggesting a documented provenance. The Tribal Affiliation is described as Unspecified Eastern United States, adding to the mystery and historical significance of this cultural relic. This unique piece, known as the Who's Who Indian Relics #12, is a valuable collectible in the realm of Native American artifacts.

Past 3 owners listed in the subtitle.  Further details may be possible but am still doing further research.  The ETFG 66 is the personal catalog number for Evan Gallo it's previous owner.