This is a Hertel Exophthalmometer (a device to measure the protrusion of the eye due to increased pressure in the eye) in its case. The case is lined with blue velvet, closure mechanism is intact, but the case itself is well used and rubbed along edges. The instrument is clean and without fault. It comes from the library of Howard Naffziger who is noted for his invention of the orbital decompression procedure to alleviate intraocular pressure. The device or box does not include his name, but to authenticate origin we include a postcard dated 1926 addressed to his daughter (and later wife of Neurosurgeon Eugene Stern), and a passenger list notice for a trip from San Francisco to Chicago in May 1936 where Naffziger entered his location (space 5 in car 85) as a passenger in his own hand.