This is a fossil Giant Armadillo osteoderm. This extinct terrestrial vertebrate was approx. 6 feet long and weighed about 500 to 600 pounds. Hundreds of these little armored plates (scutes) covered it's body.
Middle to Late Pleistocene (11,000 to 500,000 years ago), Peace River, Hardee County, Bone Valley Formation, Hawthorn Group, Florida.
Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing the specimen shown. Your purchase will include an ID label.