The tail of the microscope is engraved with the initials O.S.U. along with a corresponding inventory number. The same markings are stamped on the top of the storage case. Evidently, at one time, this instrument was in use at Ohio State University. Sometime in the 1980's Ernest Ehlers, a professor of Mineralogy at Ohio State University, purchased this microscope when the University was disposing of older equipment. It was obtained for this collection from his widow.