There are so many mosasaur jaws and teeth in matrix that are fake, that finding real examples is a rare treat. Many are just crowns placed on a 'root' and put into a fake matrix. A high percentage of what's out there are heavily restored or faked specimens.
These two rooted teeth have not been altered. There is still a piece of jaw between the two teeth and the unerupted tooth is still in place. On the reverse there is a piece of bone and a fish vertebra that I uncovered further.
The teeth measure 3.79" and 2.92" on matrix that measures 5.65" x 4.6".