This is a real, partial, osteoderm (armour plate) from a nodosaurus dinosaur!
Nodosaurus is a genus of anklyosaurian dinosaurs from the Late Cretaceous of North America. They resembled the more iconic anklyosaurs, but lacked the distinctive tail clubs.
These fossil scutes are from the Judith River Formation of Montana and date back to 100.5-97 million years before present.
They come framed in a ~5.5" wide riker mount and can be shipped worldwide.
PRICE IS PER SPECIMEN, though the photos in this gallery are indicative of the variety you will receive.