No lie, Vanadium Tool Co. was in Athens, Ohio?? I did not know that. I'm only about an hour from there.
I have a pile of those I have gathered up building a set. I'll check if I have an extra 9/16 in the bunch. heck, I'm not even real sure of what I need to finish the set, but I'm pretty close. I know I have doubles in the smaller sizes like 1/4, 3/8, etc.