If I can add anything...
Well, ah, that's certainly informative to some degree. Not sure what degree though.
Thank you unworthy1 for a nice answer. Reading thread specs is one thing but feeling the effect in your own hands is another. I gather that a mismatch would at least be noticeable and probably enough to indicate an error to a non-idiot. A phone call a moment ago also gave me reason to believe that whoever worked on this hub was most probably
not an idiot.
The world is a fascinating and mysterious place, especially when a bike of unknown history is involved.
Thank you all.