This is a fine and large example of a fossil Megalodon (Carcharocles megalodon) shark tooth recovered from the Cooper River in Charleston county, South Carolina. It dates from the Miocene period (approx. 5-23 million years ago).
This tooth is a great display or hand specimen. It has nice heft to it and measures 4.02-inches along the blade (approx. 102mm in length). The blade is intact and still has good serrations on it. The backside of the tooth has some minor flaking of the enamel and a small weathering cavity in the root base - neither of these issues are visible from the front and it looks great in hand or in a display case. If not for those minor flaws, this tooth would cost 3x more. Notably, the coloration is somewhat atypical for this locality.
Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing the tooth shown. Your purchase will include an ID label.