Serrated, 1.65" Tyrannosaur (Nanotyrannus?) Tooth - Montana

This is a 1.65" long Tyrannosaur tooth from the Hell Creek Formation of North Dakota. The enamel is pretty worn as are about half of the serrations. Many people would label a tooth like this as coming from Nanotyrannus lancensis but there is a very contentious and ongoing debate about whether this is a distinct species of represents a juvenile Tyrannosaurus rex.