Not sure of the ignition wrench title. I always had the impression that ignition wrenches were usually smaller than 1/2inch. Alot of sets stop at 7/16.
However, my Dad gave me one of these (1/2-9/16) about 10 years ago. Never asked him where it came from. After we lost him, I found another in his toolbox. I now have 2. It is a very usable wrench. The angles are correct for self ratcheting action without slipping. Works better than most of the others of this generic type, even the new Craftsman ones. Great glovebox wrench for an older vehicle. For all the pleasure collecting tools gives us, just remember the great men's minds that created such a wide variety of working tools.