The Addressograph Model 70 is a medical imprinter  and the reason for the “Notch” in WW2 Dog tags. The Model 70 used the “notch” on the WWII Army dog tags, as a “locating notch” and is referred to in both Addressograph and government documentation as “locating notch.” The Model 70 was issued to medics in the field during WWII. The purpose of the Model 70 was to allow the medic to take a soldiers identification tag and transfer the information on the tag to medical documents by imprinting the text directly onto the document. The Model 70 would accept a notched dog tag and would then transfer the information on the soldiers dog tag to medical paperwork in the field.