Bought this today. Not sure how hard it is to find.

Nice.   I take it the lever is what allows the quick adjust...   Hope the rest of the jaw is better than the edge there.   Seems like a lot of the old wrenches really took a beating.   

Ira Cunningham & Haywood Flowers patented April 7, 1914, patent 1,092,695. Not that common and many of them have broken springs on the levers. Patent shows coil springs on the levers but they were made with flat springs. Nice find. I'm a buyer if you are selling.

He's probably not selling.  It looks as if it mounted as a display on his armrest.